I think it is "quadrangle".
If it has 4 equal sides and 4 right angles, "square" is right.
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a prime square
A CUBE
The mathematical term 'perfect square' means that a number, which has a rational number as its square root. 25 is a perfect square, because its square root is 5, a rational number.
Square root is a mathematical function whose argument needs to be a mathematical quantity or expression. Since helium is neither a mathematical quantity nor an expression, the question makes no sense.
1. It's a perfect square