A **perfect square** is the square of a whole number.

For example,

4 is a perfect square because 4=2x2=2^{2}

9 is a perfect square because 9=3x3=3^{2}

16 is a perfect square because 16=4x4=4^{2}

The **square root** **of a perfect square** is one of the two equal factors of the perfect square.

because 5x5=25

because 6x6=36