Square root of 4 is 2 and so 2 times 16 = 32
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It is: 4 or -4
4x4=16 the square root of 16 is 4
The negative square root of 16 can be either +4 or -4 . Both are correct.
16 is a perfect square (of 4) and the square root of 256.
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.