85 is a composite number. Other than itself and 1, it is also divisible by 5 and 17.
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It is neither. The concept of prime or composite is relevant for whole numbers greater than 1.
85 is a composite number because a number can equal it: 5 x 17 = 85
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.)
composite because it has more than two factors.
70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85 (including 70 and 85)