27 is not a square number because it won't be able to times its self
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It is: 27
Find the square root of 27. This number can be either about +5.196 or -5.196
5.1961524227066318805823390245176 squared = 27
The answer is not a rational number and therefore cannot be written out in full in decimal (or fractional) notation. It is approx 5.196152.
27