The cubes of all rational numbers will be rational. But the cubes of Irrational Numbers can be either.
Cubes of all numbers are irrational numbers, if they're not natural
4.6 is rational.
10.01 is a rational number
No. It's one or the other. No rational number is irrational.
It is a rational number
Some square roots are rational, some are irrational (and some are not even real).
Numbers cannot be rational and irrational at the same time.