Neither. It is an imaginary number.
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The square root of 57 is between 7 and 8
7.6
The square of 57 is 3249 The square root of 57 is closer to 8.
just about 7.54983443527075
2x(square root of 57) If we approximate this, it is about 15.1 but the first answer is exact and in simplest form.