No; √2 is irrational.
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The square root of 4 is 2 which is a rational number
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
Yes, because the answer is 3/2 which is a rational number.
And exponent of -2 represents the square root
2 and 1/2 are rational numbers, but 2^(1/2) is the square root of 2. It is well known that the square root of 2 is not rational.