10.86278 is. (rounded)
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The square root of 118 is 10.86278
The square root of -118 is: 10.862780491200215 i
The square root of 118 is not a whole number - the closest square number to 118 is 121 - which is 11 squared.
sqrt(118) = 10.86, which is approximately 10.9. The way this is found is simply by plugging it into a calculator and rounding it to the tenths place.
There are infinitely many of them. They include square root of (4.41) square root of (4.42) square root of (4.43) square root of (4.44) square root of (4.45) square root of (5.3) square root of (5.762) square root of (6) square root of (6.1) square root of (6.2)