A good indicator is "do you have to fill out a timesheet". If you do, that means you're probably paid an hourly wage, and you should be paid overtime; if you don't, you're probably salaried and overtime-exempt. As usual, it's more complicated than that if you get into the weeds (e.g. in the news article linked in the comment you're replying to), and having a lawyer interpret your employment contract is probably the most authoritative way to figure that out if you feel your situation is unusual.