Which of the following number (s) is a perfect square (s) ? Select all that apply. 1 2 4 5 9 11 25 36 45 81 144 225 400

A perfect square is what u get when u multiply 2 of the same numbers together.

For example : 2 * 2 = 4 ... 4 is a perfect square

3 * 3 = 9 ... 9 is a perfect square

4 * 4 = 16 ... 16 is a perfect square

2 cannot be a perfect square because u cant multiply anything by itself that equals 2.

so ur perfect square numbers are : 1,4,9,25,36,81,144,225,400