You use the square root key on a calculator, or the sqrt() function in Excel. If you want to do it without a calculator, there are several methods; one that is fairly straightforward is trial and error: just try squaring different numbers until you get close enough. (Other methods may be faster, but are still iterative - you have to repeat the same steps several times, until you get sufficient precision.)
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The area of square is : 1936.0
The square root of what? If you take the square root of the area, the answer will be the length of the side. If the area is, for example, in square meters, the length of a side will be in meters.
You square-root the area
root 2 root 2 * root 2 = 2 2 = area of the square.
Length of side = square root of area