It is: 16
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A positive number has two square roots, its principal (positive) root and its negative root. This is because a negative number multiplied by a negative number equals a positive number. In this instance, the square roots of 256 are 16 and -16.
16 is a perfect square (of 4) and the square root of 256.
16
+6 is the positive square root of 36.
The positive square root of 289 is 17.