It isn't. You're thinking of anything to the power zero.
x0 = x(n - n) which equals xn divided by xn which equals 1.
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Any number to the power of one is still the same number.
Any number to the power of zero is ' 1 '.
Anything to the power of 1 equals itself. i.e. 271=27, 9981=998 Anything to the power of 0 equals 1
Anything to the zeroth power is one. It doesn't matter what x is. 2 to the zeroth power is one.
Anything to the power zero is one (1).
Anything to the zero power equals one.
Anything to the zero power is one. So the square root is one.