Yes, it is 4.
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Yes because the square root of 16 is 4
Yes, and it is 4
Negative 64 is the square root of an integer. The square root of -64 is not an integer.
No, the square root of an integer will not always be an integer. It may or may not be. The square root of nine is three, both of which are integers. The square root of two is not an integer. In fact, it is not even a rational number.
A number such as 4, 25, 16, whose square root is an integer.