For questions about "square roots", "cube roots", and such, consider using the (arithmetic) tag.
Questions on basic arithmetic, e.g. addition, subtraction, multiplication, division, powers, radicals, etc.
But now there also exists a tags name radicals. (The tag-wiki is empty at the moment.) So this seems as a better candidate for questions about square roots, cube roots etc. Or would it be a better solution to get rid of the radicals tag and merge it into arithmetic?