it is but its not a rational #
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The square root of 5 squared is 5, which is a rational number.
The square root of 5 is an irrational number
The square root of a number is that number which, when squared, gives you the given number. For example, the square root of 25 is 5, since if you square 5, you get 25. It is the "inverse function" (that is, in a way it's the opposite) of squaring.
It is an irrational number and its square root is 2.2 to the nearest tenth
The square of 500 is an irrational number and it is 10 times the square root of 5