The square root of 729 is 27.
Yes, it is a rational number because 27 can be written as simple fraction, 27/1.
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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.
27
The square root of 48 is a rational or irrational
Yes, it is the principal square root of 4, and it is rational.