No it is not, when you square it, it comes out to be 2.828427125...
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The square root of (any number that isn't a perfect square) is irrational.
Yes. In general, if an integer is not a perfect square, its square root is irrational.
Yes. The square root of any whole number that is not a perfect square is irrational.
Irrational. The square root of a positive integer is either an integer (that is, if the integer is a perfect square), or an irrational number.
No. However, the square root of any positive integer that is NOT a perfect square, IS irrational.