111 must be an 'or', because it certainly is not a prime!
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prime factors for 111 = 3, 37
111 is composite. If the sum of the digits in the number is divisible by 3, then the number itself is. 1+1+1 = 3, therefore 111 is divisible by 3. 111/3=37 37 is prime, so the prime factorisation of 111 is 3x37.
113 is a prime number. 111 and 115 are composites.
As a product of its prime factors: 3*37 = 111
111 = 31 x 371