No, it is not.
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Yes. The square root of 49 is 7, because 7 * 7 = 49. Seven does not have a decimal and is therefore a whole number.
The square root of 15 is not a whole number.
The square root of 26 is not a whole number
Negative the square root of 36 is -6, which is a whole number.
nope! take the square root of 5, 2.236067978... which is not a whole number! hope this helps!