Yes. All terminating decimals are.
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109 is an integer and not a fraction. However, it can be expressed in rational form as 109/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
109*1 = 109 and 109*10 = 1090 are two.
No, it is rational.
It is rational. It is rational. It is rational. It is rational.
"Rational" is an adjective and so there cannot be "a rational" (and certainly not "an rational"). Any answer would depend on whether the question was about a rational number, a rational person, a rational argument or "a rational" combined with some other noun.