It is more so an expression that numbers never end. But it can be used as a number.
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It is uncountably infinite.
Yes, an infinite number of them.
Since there is an infinite number of real numbers and an infinite number of natural numbers, there is not more of one kind than of another.
Infinitely rarely, a real number is also a rational number. (There are an infinite number of rational numbers, but there are a "much bigger infinity" of real numbers.)
A real number is a rational number that is not imaginary. 5, 3/4, and 8.6 are all real numbers. 3i is not a real number.