No.
Sqrt(4) = 2, sqrt(0.04) = 0.2 are examples where the square roots are rational.
Sqrt(3) is irrational
Sqrt(-3) is neither rational nor irrational but imaginary.
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The square root of 27 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 12 is an irrational number
The square root of 0.144 is an irrational number