It is the square of the original number. If the original number represents a length, then the square of the original number represents an area of a square with side equal to the original number.
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13 x 53 + 2= 691
When you raise a number to any power x, you multiply it by itself x times. Because 1 times anything is itself, multiplying 1 by itself any number of times will still give you 1.
Multiplying a number by 3 1/2 does not necessarily increase its value so the question is based on nonsense.
If I tell you that the square root of 2 (for example) is such-and-such, you can verify this by multiplying the number by itself, and seeing whether the result is close to 2.
180/630 can be multiplied by 0.01111.../0.01111... to simplify it to 2/7. Multiplying by 1, does not change the value of the number, and any number divided by itself equals 1.