It is s units on some unspecified scale for measuring length.
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If the side of the square is of length s then the perimeter is 4*s.
If the length of a side of the square is S units then the diagonal is S*sqrt(2) units in length.
the side length times four
The answer depends on what information you do have: the length of a side, or a diagonal, the area, ... If a side is of length s cm then the perimeter is 4*s cm.
4*s, where s is the length of a side.