(180, 1) (90, 2) (60, 3) (45, 4) (36, 5) (30, 6) (20, 9) (18, 10) (15, 12)
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64 (as it is 8 squared)
The whole number closest to the square root of 65 is 8. The whole number closest to the square root of 65 is 8.
perfect square
Yes. The square of a whole number is always a whole number. For example, 3 squared is 9, so the square root of 9 is 3. What you never have, is the square root of a whole number being a fraction that is not a whole number. The square root of a whole number is either a whole number or an irrational number. For example, the square root of 2 is irrational, because there are no 2 whole numbers a and b such that a/b squared is 2. This is not terribly difficult to prove, but I have already said too much; I have answered your question.
The square root of 55 to the nearest whole number is 7.