No. The square root of 49 is plus or minus 7, both of which are integers. And integers are rational numbers - whether they are positive or negative.
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The square root of 49 is 7, so it is rational.
Rational because it is 7.
No because 7 is a rational number
The square root of 94 is an irrational number
The square root of 12 is an irrational number