You should be able to tell what resolution you're in by looking at your LCD's OSD. Pretty much all of them have an option to tell you what resolution/mode you're running in. If yours doesn't, then you can just look at the game and tell whether it's in 1900x1200. If text is crisp and clear and nothing really looks blurry, then it's not getting scaled. If all else fails, take a screenshot and check the resolution.
If you do not want to have the tops and bottoms cropped off, then you'll have to use 1600x1200 (black bars on left and right) or use a third-party fix.
Well I checked the OSD information and sure enough it states 1900X1200 so thank you for that info to confirm. But I am curious if 1600X1200 is better as one would not lose the upper and lower sections of the screen. What are the thoughts on that?