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A perfect square is an integer (whole number) times itself. E.g. 3*3 = 9, or -4*-4 = 16.

A negative number times a negative number is a positive number. This means a negative number times itself would be positive.

It also holds true for all squares, not just perfect squares. E.g., -1.3 * -1.3 = 1.69 (which is positive).

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