No, because you cannot have an card number. The indefinite article, an, is used before a word that begins with a vowel, not a consonant. So you can have "a card" but not "an card".
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An example of a card number is 3476 5467 9845 9856
21452245
what???
Why do You want a most used credit card number...people will probably NEVER give you a most use credit card number, sorry :\
No. Even an example may inadverdantly belong to someone. Four groups of four numbers each. That's all we can tell you.