Yes this is the exact definition of what it means to be a rational number. A rational number is one that is a fraction of two whole numbers (or integers). The denominator, or the number in the bottom of the fraction, cannot be 0.
Some examples:
7 = 7/1
2/3
8/10
0.5 (since this equals 1/2)
the square root of 64 (since it equals 8 = 8/1)
any repeating decimal
any terminating decimal
Non-examples are things like...
sqrt(7)
pi
log(3)
any decimal where there isn't a clear pattern that repeats