Neither. The property of prime or composite is not defined for 1, just as it is not defined for 0 or 0.5.
Prime
103 is a prime number.
1 is a prime number.
It is a composite number.
5x3x29
85 is composite.
21 is a composite number.
21 is a composite number.
63 is a Composite Number.
180 is a Composite Number.
75 is a Composite Number.
compostie