25
it is the square of 5 (5x5=25)
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8 is a multiple and is not a perfect square.
9
Yes - any number ending in 5 or 0 is a multiple of 5.
A multiple of a number is something you get when you multiply that number by another. For instance, 5 x 2 = 10, so 10 is a MULTIPLE of 5 and a MULTIPLE of 2. If you're trying to find a multiple of a number, say, 3, multiply that number by another. It can be any number.
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