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 = 44 is a perfect square
3 * 3 = 9...9 is a perfect square
4 * 4 = 1616 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