The square root of 2 is irrational. In general, the square root of a positive integer is either an integer (if you take the square root of a perfect square), or it is irrational.
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The square root of 4 is 2 which is a rational number
no it is an irrational 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
The square root of 2, for example, is irrational.sqrt(2)*sqrt(2) = 2 which is rational.
Root 2 is appx. 1.414 and root 3 is appx. 1.732. There are many rational number between that. For instance: 1.5, 1.6, etc.