Assuming that you mean "square root and then square", the answer is as follows:
If you have studied complex mathematics, you do nothing. The square root and square are inverse operations and so you will end up exactly where you started from.
If you have not studied complex mathematics, but you started off with a number which was 0 or greater, then you do nothing for the same reason as above.
If you have not studied complex mathematics, but you started off with a negative number, then you cannot do the first step because the square root of a negative number is not [yet] defined.
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First you have to multiply the number itself like if you have 8 you multiply 8*8 just multiply itself
No, not always since: if a number is more than 1, then its square root is smaller than the number. if a number is less than 1, then its square root is bigger than the number.
The square root of 36 is 20% more than the square root of 25.
No
1 is less than the square root of 2.
139, the square root of 19321 is less than 140.