It is neither. The concept of prime or composite is relevant for whole numbers greater than 1.
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85 is a composite number because a number can equal it: 5 x 17 = 85
The number is not COMPOSITE. Instead, it is a prime number.
Composite (the only even number that is prime is2).
Composite
It is 1 that is neither a prime or a composite number The number 1 is neither prime nor composite.