Yes, you can visit the Prometric Test Center before your scheduled exam date. In fact, you are highly encouraged to do so. This will allow you to know the directions to the test center and avoid the risk of getting lost, showing up late for the exam, or missing your exam altogether.
Tip: When you visit the Prometric Test Center, you can also carry your identification documents and have them verified in advance by the staff at the center, to avoid any last minute hassles and anxiety before the exam. (Note: you must bring the identification documents again during the exam even if you had them verified in advance.)