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They always start with a 4. Mastercard always starts with a 5.
A Visa card number is the unique 16-digit number embossed on the front of a Visa card. This is your account number and is needed anytime you want to charge anything to the card.
"There are several ways to tell if a credit card number is a Visa card number or not. First, Visa numbers always start with the number 4. They are also usually 13 or 16 digits in length."
It is the large embossed 16 digit number on a credit or debit Visa card.