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The square root of 15 being 3.87 the closest whole number would be 4
The square root of 135 is 11.61895. The two whole numbers closest would be 11 and 12.
12
No, because 15 is not a perfect square. The closest perfect square is 16, whose square root is 4.
No. Such a number is referred to as a perfect square. The closest perfect square to 23 is 25, the square root of which is 5.