What is a Credit Card Account Number?

cred - it card ac - count num - ber
The number that uniquely identifies a specific credit card account.
For more information, read "The Payments System Simplified"
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How Does a Credit Card Account Number Work?

The first 6 digits of the number are the Bank Identification Number, identifying the Issuing Bank. The last digit is a check-digit, used to detect errors. The remaining 9 digits represent the account number assigned to the cardholder. The type of account assigned by the Issuer — for example, classic, debit, signature, business, commercial, and prepaid — is one component in pricing the transaction to the Merchant.