It belongs to the rational numbers which is a subset of the real numbers. The reals, in turn, is a subset of complex numbers.
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Not whole numbers. Yes to real numbers and integers.
Any set of numbers that contains it. For example: {1,2,3,-0.002} {sqrt(1), pi2, 1/93, -0.002, -73}
It means that the boundaries of the set are not included in the set. For example, consider the set of numbers that are bigger than 1 and smaller than 2. The set is bounded by 1 and 2 but neither of these belong to the set.
Rational because it can be expressed as a fraction in the form of -50/1
The Rationals, the set {1, 3 , 5.86, sqrt(59), -2/3, pi2}, the reals numbers, numbers between 5 and 6, etc.