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The square root of both 0 and 1 equals the square of 0 and 1
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A square unit is a unit when squared equals a perfect square number. 5 is a square number, five times five is 25. Divid or square root 25 and you get 5. now technicaly every number is a square number but it is generally considered only whole numbers.
Yes.
No, only square numbers have an odd number of factors.