Should it be even?

The number 2 can be expressed as the ratio of 2 positive integers: for example, 21,42,\frac{2}{1}, \frac{4}{2}, or 63.\frac{6}{3}.

Is it true that if we express 2 as the ratio ab, \frac{a}{b}, where aa and bb are positive integers, then aa has to be an even number?

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