Because it has no number that can be squared to make it.
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irrational
Yes
The square root of 50 is an irrational number because it can't be expressed as a fraction.
It can be a rational number or an irrational number. For example, sqrt(2)*sqrt(50) = 10 is rational. sqrt(2)*sqrt(51) = sqrt(102) is irrational.
An irrational number.