3,333 is not a prime.
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No, the prime factorization of 54 is: 2 x 3 x 3 x 3
3333
3333
The next number up from 621 that contains all 3's in it is 3333. To figure out what whole number you need to add to 621 to get to 3333 just subtract the two. 3333 - 621 = 2712 Therefore, 2712 is the small whole number that you can add to 621 and get an answer that contains all 3's.
3 & 333/1000