7172949
C (251519) and B (3112331) are both prime. A (2359) is a multiple of 7 and D (7172949) is a multiple of 3. But, without the number for which they could be a factor, it is only possible to identify the prime numbers, not the one that is a prime factor.
3112331 is prime. It is only evenly divisible by itself and one.
It is a composite number.284 is a composite number
94 is a composite number
It is a composite number.
It is a composite number.
Both. It is a number and it is composite.
Composite number
It is a composite number.
It is a composite number.
It is a composite number.
It is a composite number.