Yes, the square of any rational number is also a rational number.
The square root of 2 is not a rational number.
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No. Though every perfect square is a rational number, not every rational number is a perfect square. Example: 2 is a rational number but sqrt(2) is not rational, so 2 is not a perfect square.
It is rational. The root of a perfect square, such as 4, is rational; the root of any positive integer that is not a perfect square is an irrational number.
The square root of 4 is 2. 2 is a rational number so they square root of 4 is rational.
No; the square root of any rational number squared is that rational number. Examples: √(2^2) = √4 = 2. √((1/2)^2) = √(1/4) = 1/2
It could be either. For example, √9 is a rational number, whereas √2 is not.