The rational numbers, since it is a proper subset of the real numbers.
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No, it is not.
No. A real number is only one number whereas the set of rational numbers has infinitely many numbers. However, the set of real numbers does contain the set of rational numbers.
The Real numbers
It belongs to the set of negative rational numbers, negative real numbers, fractionall numbers, rational numbers, real numbers.
There are rational numbers and irrational numbers. Real numbers are DEFINED as the union of the set of all rational numbers and the set of all irrational numbers. Consequently, all rationals, by definition, must be real numbers.