There are 20 such cards.
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20 of them.
2, 3, 5 and 7
Well, isn't that a happy little question! To find the largest even number using those cards, we need to see how many times each digit can be used. Since there are only 3 '9's, 3 '8's, 1 '6', and 1 '1', the largest even number would be 988866. Just remember, there are no mistakes, just happy little accidents in math!
There are four prime numbers under ten and two red suits. That would make eight. Each playing card has its number printed twice in opposite corners. That would make sixteen. I don't know if you want to count that or not.