No. Giving up meat would be hard enough but to give up dairy too? Not gonna happen!
No, In my eyes it is counter productive because they complain about meat processing although the soy even more processed not to mention the chemicals used in the flavor. I would take a nice juice stake (from a prey animal) any day.
Levi is correct ... Unless by "a2" you mean "a(squared)", in which case the statement is true ... As an odd number multiplied by itself, will be an odd number.
It would be false, since no number multiplied by 2 can ever be odd. And "2a" is more standard than "a2".