4 is divisible by 1, 2 and 4.
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All Factors of 916:1, 2, 4, 229, 458, 916
All Factors of 64:1, 2, 4, 8, 16, 32, 64
You can always check on the divisibility of a number by dividing it into another number. But if you know the divisibility rules, you can get that information easier and faster.
Divisibility refers to integers, not decimals.
It's very easy to test a number to see if it is divisible by 4 or by 9. If it passes both tests, then it is divisible by 4x9=36.To test for divisibility by 9, add the digits of the number. If the sum is divisible by 9, then the number is divisible by 9.To test for divisibility by 4, look at the last two digits. If they are a multiple of 4, then the number is divisible by 4.