No. 2.25 = 1.5^2 is a non-perfect square but it is rational.
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No. 2.25 is not a perfect square but it is rational.
Sometimes the square root of a positive number can be irrational, as in the square root of 2 (which is a non-perfect square number), but sometimes it is a rational number, as in the square root of 25 (which is a perfect square number).
The square root of (any number that isn't a perfect square) is irrational.
The square root of (any number that isn't a perfect square) is irrational.
It is irrational. * The square root of any positive integer, except of a perfect square, is irrational. * The product of an irrational number and a rational number (except zero) is irrational.