There are 16 digits in a MasterCard number, usually starting with 5.
Mostly, they are just an account number. Some of the digits, however, are "check digits." That is, they come from some mathematical formula being applied to some of the other digits. That makes it near impossible to simply make up a string of 16 digits that are a valid credit card number. Of course, the location of the check digits and the formula which generates them are carefully guarded secrets.
So, sorry, no example.
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Credit cards use 16 numbers with Mastercard starting with 5 an Visa with 4.
Typically 16
16 digits
I don't think that Mastercards have an issue number on them, mine certainly doesn't.
Most Visa cards start with the number '4' and Mastercards with the number '5'.