27
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No because the square root of 729 is 27 which is a rational number.
The cube root of 729 is 9 and 9 squared is 81.
The square root of 729 is 27.Yes, it is a rational number because 27 can be written as simple fraction, 27/1.
27i where i is the square root of -1.
729 243,3 81,3,3 27,3,3,3 9,3,3,3,3 3,3,3,3,3,3 3^6 = 729 The cube root is 3^2, or 9.