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The symbol for a a square root sign is: √
The only thing that a square root symbol does is that it symbolises an operation (taking the square root) of whatever is under the sign.
It is a number.
Unfortunately the browser that we are forced to use cannot support anything but the most basic fonts. In Word, in the symbols menu, it is Character code 214 in the Symbol font.
Look for square numbers that are factors of 540, like 36. The square root of 540 = 6 times the square root of 15.