What are the last 4 numbers on an American Express?

The last four numbers on an American Express card, like other credit cards, are specific to each individual account and are unique to that card. They are part of the card's 15-digit number, which includes a four-digit card number on the front. For security reasons, it's important to keep your card information private and not share the complete card number. If you have lost your card, it's best to contact American Express directly for assistance.