While painting a room with any interior paint does not specifically require a coat of primer, it is suggested. Primer helps prepare a wall for painting by covering up imperfections.
In general, one coat or primer is used, followed by two coats of paint. If going from a lighter paint color to a darker one, the primer should be tinted to match the color of the paint. Walls that are rough should be sanded smooth before priming to ensure a quality paint job. Walls, especially those in kitchens and bathrooms, should be washed with soapy water before priming to remove any grease or mildew.