No.
The cube root of 3, for example is irrational.
But the square of cubert(3) is 3 to the power 2/3, which is irrational.
Another example, pi2 is irrational (in fact so is pi to any non-zero power).
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Numbers cannot be rational and irrational at the same time.
No, the result is always an irrational number. In more advanced math it is possible to add an infinite amount of rational numbers by way of Taylor Series and get an irrational number. This is how numbers like "Pi" and "e" are derived.
The product of an irrational number and a rational number, both nonzero, is always irrational
No. 0 is a rational number and the product of 0 and any irrational number will be 0, a rational. Otherwise, though, the product will always be irrational.
Yes, always.