Any set that contains it.
For example, the set {1, 2.3, 2.236067977}
or {-79000, pi, 2.236067977, sin(47)}
or all real numbers,
etc
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The set of complex numbers is a field which contains the set of real numbers as a proper subfield.
The set of even numbers contains the prime number, 2. The set of composite numbers contains infinitely many odd numbers.
No, the other way around.
Real numbers form a proper subset of the set of complex numbers.
They are called rational numbers. The set of rational numbers contains the opposites of its members.