One of them would be the cube root.
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A cube root.
If a number has equal factors, it is a perfect square and the equal factors would be square roots.
If a number has three factors, it's a perfect square. One of those three factors (apart from 1 and the number itself) would be the square root.
Prime numbers have two factors. Prime squares have three factors. Square numbers have an odd number of factors but that number varies.
Eight factors.