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The square root of a positive integer can ONLY be:* Either an integer, * Or an irrational number. (The proof of this is basically the same as the proof, in high school algebra books, that the square root of 2 is irrational.) Since in this case 32 is not the square of an integer, it therefore follows that its square root is an irrational number.
The square root of 94 is an irrational number
The square root of 12 is an irrational number
The square root of 0.144 is an irrational number
The square root of 12 is an irrational number