3

3 is the second prime number and the second single digit prime number. 3's prime factors are 1 and 3. It's the first odd prime, because the only even prime number is 2.
It is also the first Fermat prime, the first pi-prime number, the first prime of the form floor, and the first Mersenne Prime.
==Proofs==
*
*
*
*Therefore, it has 2 factors.
==As an Exponent of Mersenne Number==
2^3-1, which is the number 7, is a prime number. It is the 2nd Mersenne Prime.
==Relationship with other numbers==
===The numbers before===
*2 is the first prime number. It is the only even prime number.
*1, the number before 2, is not a prime number.
===The numbers after===
*The next number, 4, is the first composite number, and a square number. It is the square of 2.
*The next odd number, 5, is a prime number.
**There are no odd numbers between 3 and 5, and they are two numbers apart. As a result, they are twin primes.
*7, the odd number following 5, is a prime number.
**3 and 7 are four numbers apart, therefore, they are cousin primes.
*9, the odd number following 7, is not a prime number. It is a square number and the first odd composite number.
==Usage==
===General===
*Trilogy refers to a set of three works of art that are connected, either as a single work or three individual works.
===Science===
*Lithium's atomic number and the number of electrons are 3.
*Tritium (hydrogen-3) has a nucleon number of 3.
===Sports===
*In basketball, a shot behind the three-point arc is worth three points, unless in the 3x3 variant.
*In baseball, 3 strikes are required for the player to be considered "out", and 3 outs are required for the attacking team to exchange with the opposing team.
===Video Games===
*In The Legend of Zelda series, there is a sacred relic called Triforce, which consists of three separate golden triangles.
tl:3
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== Trivia ==
* There are only three consecutive odd numbers. 3, 5, 7. Later it's impossible because every 3rd odd number is composite, because it's divided by 3.
03
0003
Category:1-Digit Prime Numbers
Category:Twin Primes
Category:Mersenne Primes
Category:Fermat Primes
Category:Circular Primes
Category:Additive Primes
Category:Fibonacci Primes
Category:Cousin Primes
Category:Factorial Primes
Category:Palindromic Primes
Category:Chen Primes
Category:Pi-Primes
Category:Primes of the Form Floor
Category:Oban Primes
Category:Nban Primes
Category:Iccanobif Primes
Category:Right trunctable primes
Category:Consecutive Prime Numbers
Category:Iban Primes