It's neither of them because -4 is not a natural number and prime or composite numbers are a subset of natural numbers i.e. only natural numbers can be classified as prime or composite numbers.
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4 is a composite number because it is divisible by more than only 1 and itself. It is also divisible by 2. All even numbers (except the number 2) are composite.
It ends in a 4 and therefore is divisible by 2, which means it is not a prime number. It is a composite number.
4, which is the square of the prime number 2, is the smallest composite number.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 4 is composite.
Composite
composite; 2 and 4 are its factors