Which are perfect squares? Check all that apply.

A perfect square is a number that can be written as an integer multiplied by itself. Here, 9 = 3 × 3, 16 = 4 × 4, 169 = 13 × 13, and 625 = 25 × 25, so these are perfect squares. The numbers 24 and 200 are not squares of integers.

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