Yes, it is.
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Yes, -789 is a rational number
Yes, 789 is a rational number, as it can be expressed as a fraction.
789 is an odd number.
To any set that contains it! It belongs to {789}, or {789, sqrt(2), pi, -3/7}, or {789, bananas, France, cold} or all whole numbers between -43 and 5003, or multiples of 3, or composite numbers, or counting numbers, or integers, or rational numbers, or real numbers, or complex numbers, etc.
As much as, in these days of uncertainty, anything can be anything. As long as the constraints of a rational number are kept to, a rational number will always remain a rational number.