I will assume that you mean " to the power of two ". A symbol for any n-power is to put the number (n) on the side, above the number.
Like this: nn.
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To find the square root of a number you would use the square root symbol on the calculator, √, then enter the number. Ex.: √25=5.
not on your keyboard. But there will in most word processing programmes a character map, and in this you'll find a sq root symbol, at least in the math character sets.
if it has a square root sign or any symbol (ie. x or pi) then it is irrational. everything else is
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The symbol for a a square root sign is: √