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If the answer is a whole number (integer) you will get a whole number. However, square root of 8 is indeen 2*square root of 2. You seem to be confusing the square root of a number and its half. 4 is the square root of 16, not 8.
I think you should review the notion of square root.
The square root of a number, A, is the number X, which when multiplied by itself (or raised to power 2) gives A.
X*X = A, means X=square root of A.
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