In most cases the answer is yes. In fact its a good idea to have your alignment check twice a year. Your car alignment helps with gas milage and tire wear. If your wondering if you have a good alignment here are some things to ask yourself.
Does your vehicle drive straight or does it pull to the left or right?
Is the steering wheel straight when your going down the road?
When you look at your tires does the wear look even on them?
If not, chances are you probably need an alignment.