Yes. Because they have to be a rational number
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No. The square roots 8 are irrational, as are the square roots of most even numbers.
The square roots of 196 are 14 and -14.
Both 9 and -9 are square roots of 81
You cannot conclude anything.2.25 is not a perfect square but its square roots are +/- 1.5 so it is perfectly possible for a number which is not a perfect square to have a rational square roots.
'47' is a prime number, so it does not have a rational square root. sqrt(47) = 6.8556546... to 9 d.p. An irrational number which cannot be converted to a quotient; that is made into a fraction. NB The square roots of prime numbers are irrational.