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No, it is rational.
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This is just an arbitrary convention, based perhaps on the fact that each 'even' number can be divided into equal portions. The 'odd' numbers are not curious in any manner other than they can be only be divided into equal groups of 'odd' numbers. e.g. 15 may be divided into 5 groups of 3. BUT 7 cannot be divided into an equal number of groups.
Expressed as a mixed number, 15/7 is equal to 2 1/7 or two and one seventh.