Yes, 789 is a rational number, as it can be expressed as a fraction.
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Yes, -789 is a rational number
Yes, it is.
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.
1, 3, 263, 789.
0.0292