is 4 a rational number
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No, the square root is 4 so that means it is rational because it can be turned into a fraction!
The square root of 1/16 is 1/4, so yes it's rational.
No.
The square root of 9/16 is 3/4 which is a rational number
The square root of 16 is ±4 which is the rational number ±(4/1)