This is squaring the number and is indicated by a superscript 2 beside the number. for example, 52 = 5x5 = 25. The opposite is the square which is indicated by a kind of arrow over the number. the sq root of 25 for instance is 5
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to multiply a number by itself
is to square it.
A square number is the product you get when you multiply a number by itself.
Multiply the number by itself.
Multiply it by itself.