Square numbers are non-negative. Another way of saying that a (non-negative) number is a square number, is that its square root is again an integer. For example,  = 3, so 9 is a square number.
The squares smaller than 70 are:
There are infinitely many square numbers, as there are infinitely many natural numbers.
The number "m" is a square number if and only if one can compose a square of "m" equal (lesser) squares:
A square with side length "n" has area .
The expression for the "n"th square number is "n". This is also equal to the sum of the first "n" odd numbers as can be seen in the above pictures, where a square results from the previous one by adding an odd number of points (shown in magenta). The formula follows:
So for example, .
A square number can end only with digits 0, 1, 4, 6, 9, or 25 in base 10, as follows:
A square number cannot be a perfect number.
All fourth powers, sixth powers, eighth powers and so on are perfect squares.
Squares of even numbers are even (and in fact divisible by 4), since .
Squares of odd numbers are odd, since .
It follows that square roots of even square numbers are even, and square roots of odd square numbers are odd.
As all even square numbers are divisible by 4, the even numbers of the form are not square numbers.
As all odd square numbers are of the form , the odd numbers of the form are not square numbers.
Squares of odd numbers are of the form , since and is an even number.
Miami-Dade County, Florida
Miami-Dade County (formerly known as "Dade County" and many times referred to as simply "Miami" or "Dade") is a county in the southeastern part of the state of Florida. The United States Census Bureau estimates that in 2006, about 2,402,208 people lived in the county. That is more than any other county in Florida. Among all United States counties, it is in eighth place. The county seat is the city of Miami. It is the largest county by population in Florida.
Broward County, Florida
Broward County is a county in the U.S. state of Florida. As of 2000, 1,623,018 people lived there. This makes it the second most populated county in the state. According to 2006 U.S. Census estimates, 1,787,636 people lived there. Its county seat is Fort Lauderdale, Florida.
Broward County is part of the "Miami metropolitan area", which was home to an estimated 6,012,331 people at the 2015 census.
In the U.S. Census of 2010 the Ethnic/Race Demographics were:
Broward county was created in 1915 and was named with the second surname name of the former Florida governor: Napoleon Bonaparte Broward. Since then it has had a great growth in the XX century, mainly as "retirement place" for old people from northeastern US and French Canada.
Max Mayfield
Britt Max Mayfield (born on September 19, 1948 in Oklahoma City, Oklahoma) is a meteorologist. He was the director of the National Hurricane Center from 2000 to 2007. As director, Mayfield became a trusted voice in preparing for weather-related disasters, particularly those involving tropical storms and hurricanes.
Levee
A levee, or levée, is a raised bank of a river. A levee (European name: dike) offers protection against floods. There are two types of levee: Riverdikes and seadikes. The seadike was invented in Holland in 1277.
The first dikes were built in ancient Mesopotamia. The levees they used were earth walls and gave protection against the meltwater. 3000 years ago levees were used in ancient Egypt for irrigation systems.
'Levée' comes from the French verb "lever", "to raise". Other names are 'floodbank' or 'stopbank'. It is a natural or artificial wall, usually earthen, and often parallels the course of a river. The term "levee" came into English use in New Orleans circa 1672. The word dike comes from the Dutch verb "dijk".
River delta
A river delta is a landform where the mouth of a river flows into an ocean, sea, desert, estuary, lake or another river. It is formed by sediment carried by the river being deposited in the wider mouth. This happens because the water moves less quickly there.
The word "delta" comes from the upper-case letter delta, Δ , in the Greek alphabet because many river deltas are triangular like this letter.
A river delta can cover just a few square miles, or an area of hundreds or thousands of square miles of land.
Lockheed C-5 Galaxy
The C-5 Galaxy is a very big military cargo aircraft made by Lockheed (now Lockheed Martin) used by the United States Air Force. It first flew in 1968 and was introduced in 1970. It is one of the biggest transports in the world. It is 247 feet (75 meters) long, 65 feet (19 meters) high, has a wingspan of 222 feet (67 meters), and can weigh up to 840,000 pounds (378,000 kilograms).
It is used to fly military equipment on to battlefields, and because of its size, it can even carry tanks and helicopters. Five C-5s have crashed.
Template (word processing)
The term template, when used in the context of word processing software, refers to a sample "fill-in-the-blank" document that can be completed either by hand or through an automated iterative process, such as a with a wizard. Once the template is completed, the user can edit, save and manage the result as an ordinary word processing document. Word processing templates give the ability to bypass the original setup and configuration time necessary to create standardized documents such as a resume. They also give the automatic configuration of the User Interface of the Word processing software, with features such as autocompletion, toolbars, thesaurus, and spelling options.
Hurricane Betsy
Hurricane Betsy was a strong hurricane of the 1965 Atlantic hurricane season which caused a lot of damage in the Bahamas, Florida, and Louisiana. Betsy made its most strongest landfall near the mouth of the Mississippi River, causing major flooding of the waters of Lake Pontchartrain into New Orleans; at the time it was the costliest hurricane in the history of the United States, and, as the first hurricane to cause over a billion dollars in damages, earned the nickname "Billion-Dollar Betsy".
It first hit the Lesser Ahtilles then Miami and New Orleans. 75 people died.
Houston Chronicle
The Houston Chronicle is the largest daily newspaper in Texas, USA. As of March 2007, it is the ninth largest newspaper circulating in the United States. With the demise of its long-time rival the "Houston Post", its nearest major competitors are located in Dallas-Fort Worth.
Delta wing
A delta wing is a wing used on fixed-wing aircraft, mainly fighter aircraft. Delta wings are triangles. Some were "tailless" (which means they had no elevators) and others were "tailed." Many of the Dassault Aviation Mirages had delta wings (like the Mirage III, Mirage V, Mirage 50, and Mirage 2000).
Popular Mechanics
Popular Mechanics is an American magazine devoted to science and technology. It was first published January 11, 1902 by H.H. Windsor, and has been owned since the 1950s by the Hearst Corporation There is also a Latin American edition that has been published for decades and a newly formed South African version available.
"Popular Mechanics" features regular sections on cars, trucks, science, technology, home how-to and outdoor adventures. A recurring column is "Jay Leno's Garage" featuring observations by the famed late-night talk show host and vehicle enthusiast.
Scientific American
Scientific American is a popular science magazine, published (first weekly and later monthly) since August 28, 1845, making it the oldest continuously published magazine in the United States. It brings articles about new and innovative research to the non-scientific audience.
The Times-Picayune
The Times-Picayune is a tri-weekly newspaper published in New Orleans, Louisiana, United States.
Poultry