yes it is, because it can be written as a ratio 13/1
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13 is rational. Rational numbers are numbers that can be written as a fraction. Irrational Numbers cannot be expressed as a fraction.
13 is rational
13 is the ratio of 13 to 1 ... nice and rational.
13 is the ratio of 13 to 1, so it's rational.
Irrational.
The product of a rational and irrational number can be rational if the rational is 0. Otherwise it is always irrational.