15 is composite number 17, 19 and 23 are prime numbers.
15 has more than exactly two factors (1, 3, 5, and 15), therefore it is composite. 17, 19, and 23 each have exactly 2 factors (1 and the number itself), so they are primes.
No
56 + 17 = 73 The only factors of 73 are 1 and itself. It is a prime number, not a composite number.
It is prime
15
9 and 15 are composite numbers because they have more than two factors
15 is a composite number - it can be divided by 3 and 5. 11, 13, 17 and 19 are all prime numbers, not composite.
15 is composite number 17, 19 and 23 are prime numbers.
It is 15
It is a composite number: 442 = 2 x 13 x 17
The whole number between 13 and 17 is 15
221 is a composite number. Other than itself and 1, its factors are 17 and 13.
221 is a composite number having the factors 1, 13, 17, and 221.
11713 is not prime. 11713 = 13 * 17 * 53
1105 is not prime. 1105 = 5 * 13 * 17
17 is a prime number - the next composite number after 17 is 18.