4 i think
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1, 2, 5, 10, 25, 50
1, 5, 7, 35.
4345
The number 7 can be equally divided by the numbers 1, and 7. If divided by 2, 3, 4, or 5, you would get a fraction or a number with a decimal point.
85 is a composite number because numbers other then 1 and itself equally go into it. 5 x 17 = 85, so 5 and 17 both go into 85 making it a composite number. (All numbers ending in 5 are composite, because 5 goes into them.)