# What is a perfect Square?

A perfect square is a number that can be expressed as the product of two equal integers.

### Examples of perfect squares

• 9
• 9 is a perfect square because it can be expressed as 3 * 3 (the product of two equal integers)
• 16
• 16 is a perfect square because it can be expressed as 4 * 4 (the product of two equal integers)
• 25
• 25 is a perfect square because it can be expressed as 5 * 5 (the product of two equal integers)

### Non examples of perfect squares

• 8
• 8 is a not perfect square because you cannot express it as the product of two equal integers
• 5
• 5 is a not perfect square because it cannot be expressed as the product of two equal integers
• 7
• 7 is a not perfect square because you cannot express it as the product of two equal integers