You get back to the number which the square root relates to.
i.e. The square root of 16 is 4.
4 times 4 is 16.
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Simple...multiply that square root by itself.
You multiply your anwser by itself
To get the original number, multiply the square root of the number by itself.
If you multiply it by itself you get 13. This is what square roots do!
That the square root of 144 is 12 can easily be verified: just square 12 (multiply it by itself), and you get 144.