No. The square root of 81 is 9, which is a rational number.
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The square root of 94 is an irrational number
The square root of 27 is an irrational number
Irrational. The square root of a positive integer is either an integer, or an irrational number.
The square root of 12 is an irrational number
The square root of 0.144 is an irrational number