8 is a multiple and is not a perfect square.
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16, 36, 64, 100, 144, 196 etc The square of any even number is a multiple of 4 because an even number is 2n and (2n) squared is 4 (n squared).
9
A square number is the product of a number and itself. 16 is square; it is the product of 4 and 4; 4 times 4.
No - a smaller number can never be a multiple of a number, only a factor. But 4 is not a factor of 62, either.
25 it is the square of 5 (5x5=25)