Yes, albeit an irrational number
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No because it is 2 times the square root of 21 which is an irrational numberThe square root of 84 is not a rational number
The square roots of 21 are 4.5826 (rounded) and the negative of the same number.
Yes because 21 is a rational number
irrational
Yes. The square root of a natural number (positive integer) is either an integer, or an irrational number.