Loyalty card numbers can be in any format - since they are not usually meant to be used in any other store than the one that issued it.
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An example of a card number is 3476 5467 9845 9856
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".
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.