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4 is the integer the proceeds 3 and preceeds 5. The prime factorization is 22. A number is divisible by 4 if the last 2 digits are divisible by 4. 4 is a highly composite number, meaning that it has more factors than all the numbers smaller than it. (Which is only one, two, and three.)  

Times Tables

* 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
4 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80