No. A number will have a rational square root, only if both the numerator and denominator of the simplified fraction are squares of integers.
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No. The square roots of perfect squares are rational.
No. The square roots of 2, 3 and 5, for a start, are not rational.
No, they are not.
Because some of them are squares of rational numbers. So their square roots are the rational numbers.Thus if x is rational, then the square roots of x2, which are -x and +x are both rational.
No. Relatively few square roots are.