No, a credit card is a form of revolving credit, not an installment loan. With revolving credit, you aren’t borrowing a lump sum and paying it back in installments; instead, you can repeatedly borrow money up to a limit and pay back the money monthly, either partially or in full.
If you don’t pay the full credit card balance at the end of the monthly billing cycle, you are carrying over, or “revolving,” the balance to the next month (and paying interest on your balance).