999 is the greatest 3 digit number and it is odd because it ends with a 9.
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The greatest 2-digit even number is 98
997
To be an even number then the final digit = 2. The largest single prime digit is 7 (as both 8 and 9 are composite). The greatest even number fulfilling the conditions is 77777772.
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-998 would have to be the lowest three digit even number. If you mean a positive number, it would be 100.