The power of 1/2 or 0.5
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A square root is a number raised to the exponent (power) 1/2.
They are not.
The square roots of 21 are 4.5826 (rounded) and the negative of the same number.
Exponents are usually written like this: 3^2 means "3 to the second power". Square roots are often written with sqrt in front, such as as sqrt(5)
1 and the positive and negative square roots of 2