57 is the square root of 3249
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Since 57 is not a perfect square, its square root is IRRATIONAL.
57 = 3 x 19 [neither of which are perfect squares], so it is already simplest form.
38 is not a perfect square. Its square root is a fraction and the square root of a perfect square is always an integer.
A principal square root is any square root that's answer is positive, and a perfect square root is a square root that's answer is an integer.
16 is a perfect square (of 4) and the square root of 256.