Numbers with integer square roots are called perfect squares. For example, 64 is a number with an integer square root. 64 is the product of . When a number can be created by multiplying an integer by itself, it is called a perfect square. Examples of numbers with integer square roots are 1, 4, 9, 16, and 25. All of these numbers have integer square roots. 25 is a perfect square which is the product of . This means that 5 is the square root of 25.Not all numbers will have integer square roots. For example, 5 does not have an integer square root. No integer times itself has a product of 5. We can get close: , , and , but 5 is not a perfect square, so it does not have an integer square root.