Acc. to Huckel's rules, a molicule should be planar to be aromatic.
As you asked, N should have 3 bonds, it shoud have a pi bons. if the pi bond C=N is made C-N, it wont be aromatic anymore, you can check by making resonating structures.
If bond b/w C and N is single, due to tetrahedral shape, molicule wont be planar anymore.