1, all whole numbers are divisible by 1
2, all even whole numbers are divisible by 2
3, add up the digits and if the sum is divisible by 3 the number is divisible by 3
eg.4545, 4+5+4+5= 18 18 is divisible by 3 meaning 4545 is divisible by 3
4, If the number is divisible by 2 twice with no remainder
5, all whole numbers that end in 0 or 5 is divisible by 5
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