Any number that ends in an even number (0, 2, 4, 6, 8) is divisible by 2.
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All even numbers are divisible by 2.
Numbers divisible by 6 will have at least one 2 and one 3 as prime factors because 2 x 3 = 6. The same is true for 2, 4 and 8. Numbers divisible by 4 are also divisible by 2. Numbers divisible by 8 are also divisible by 4 and 2.
Odd numbers
All the numbers ending with 0,2,4,6,8 are divisible by 2.
172 is divisible by these numbers: 1, 2, 4, 43, 86, 172.