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Well, not just GMAT . Zero is generally considered even.

An integer n is called even if there exists an integer m such that n = 2m, and odd if n+1 is even.

I always thought zero is neither odd nor even. The properties of even/odd nos. -

Even => 2n and Odd => 2n-1 where 'n' is a natural number.

But as per OG zero is even

however one thing to note is that zero is neither +ve nor -ve

As far as sign of 0 is concerned it is generally accepted that 0 can be both +ve as well as -ve as +0 =0 & -0 = 0 hence both would be the same nos,
I believe specially on a DS question if it is asked to check some value is +ve or -ve and if it comes out to be 0 or can possibly be 0, I think we can simply use it as required by the question & not against it i.e if question wants +ve value, use it as +ve and vice versa.