2 does belong to the set of imaginary numbers. Any real number is also imaginary. Imaginary numbers are the set of all numbers that can be expressed as a +b*i where "i" is the square root of negative one and "a" and "b" are both real numbers.
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No difference. The set of complex numbers includes the set of imaginary numbers.
The number -4 belongs to the set of all integers. It also belongs to the rationals, reals, complex numbers.
Rational numbers and Real numbers
-5 to a set number is -5
The set of Real NumbersThe set of Imaginary Numbers