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The square root of 225 is 15, which is a rational number.
If you mean the square root of 196/225 then it is 14/15 which is a rational number because it can be expressed as a fraction.
15 is the square root of 225 (15 x 15 = 225).
The square root of 225 is 15, which is NOT an irrational number.
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.