The square root of -118 is: 10.862780491200215 i
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The square root of 118 is 10.86278
The square root of 118 is not a whole number - the closest square number to 118 is 121 - which is 11 squared.
square root of a negative number is imaginary square root of negative 1 is defined as i square root of negative 144 is sqrt ((144)(-1)) = 12i
10.86278 is. (rounded)
The square root of a negative number is not real.