No, 13 is prime.
13 is prime.
It is a prime number.
No, it is a prime number
It is a prime.
169 is divisible by 13 in addition to 1 and itself. It is not prime.
3367 is a composite number. Its prime factors are 7, 13, 37
No 13 is not a composite number. 13 is only divisible by 1 and itself. So it is a prime number.
The sum of any two prime numbers is not always a composite number. The sum of 2 and 11 is 13, and 13 is a prime number, not a composite number.
13 is a prime number, 63 is a 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.
13 and 19 are prime. 33 and 45 are composite.