Put the bike upside down and begin to loosen the front wheel. Watch how the inside face of the dropout lines up with the outside face of the hub/locknut. Should be nice and parallell, like ][.
If it's more like ]/ it's wrong. If the wheel is a press fit between the dropouts, it's wrong. If there's a considerable gap between drop outs and locknuts(say, more than 1/4" total) it's wrong.
Once the wheel is out, try putting a known flat surface - like a laptop - against the fork lowers. The fork lowers should be parallel, meaning that it should be possible for both legs to make contact with a flat surface simultaneously, and along the whole length.