Yes because 2*2 = 4
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If the square root is a whole number, then the square of the square root, the original number, is also a whole number; all whole numbers can be expressed as themselves over 1, and so are rational numbers. The answer is thus any square number, ie the square of the natural numbers: 1 (1²), 4 (2²), 9 (3²), 16 (4²), etc.
The square root of 15 being 3.87 the closest whole number would be 4
4
Yes and it is 2
A perfect square is a rational number equal to the square of a whole number.