It is: 100
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No- the closest perfect squares are 36 (perfect square of 6) and 49 (perfect square of 7)
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.
No, because 15 is not a perfect square. The closest perfect square is 16, whose square root is 4.
4 = 22
It is: 25