Credit cards use 16 numbers with MasterCard starting with 5 an Visa with 4.
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An example of a card number is 3476 5467 9845 9856
3790 143812 *****
0000 0000 0000 0000
Most credit cards I know of have a 16-digit number. It will often be divided into groups of 4 on the card, but this is mostly for readability. I hope this question isn't an attempt to get someone to provide you with a valid credit card number.
it's a credit card number.