No, the best way to figure this out is to plug into a scientific calculator and if the answer you get has a square root around you know its irrational.
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The square root of 225 is 15, which is NOT an irrational number.
225/7 is an irrational decimal, so 225 is not a multiple of 7.
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.
When added to a rational number, any irrational number will produce an irrational number.also, when added to an irrational number, any rational number will produce an irrational number.