It is irrational because it can't be expressed as a fraction.
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The square root of 47 is an irrational number.
The square root of 71 is an irrational number
the square root of 26 is a irrational number
It is a irrational number. Because the square root of every imperfect square is irrational number.
The square root of 155 is an irrational number.