Q: If you add a prime number to it self is the sum composite or prime?

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Composite.

Composite.

You may mean: 3 and 5 are prime numbers that add up to the composite number of 8

If you add the digits together, you get 12. Since 12 is divisible by 3, 327 is also divisible by 3.

Prime. It is only divisible by itself and one.

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Composite.

Composite.

Not necessarily. For example 15 and 16 are composite numbers. They add to 31, which is a prime number. Similarly, the composite numbers 20 and 21 add up to 41, which is a prime number.

The sum of two prime numbers will be composite unless one of the prime numbers is 2.

composite

267 is a composite number - since the digits of the number add up to a multiple of three, it is divisible by 3. Its prime factorization is 3 x 89 = 267.

You may mean: 3 and 5 are prime numbers that add up to the composite number of 8

If you add the digits together, you get 12. Since 12 is divisible by 3, 327 is also divisible by 3.

Prime. It is only divisible by itself and one.

As long as 2 is not one of the primes that you are adding, then I can guarantee that you will get a composite. 2 is the only even prime number. Any time you add two odd numbers together, you will get an even number (which is not prime). So if you add them in pairs, you will have three even numbers, which added together result in an even number, so it is composite. If you throw in 2 as one of the primes that you're adding, then your result is odd, and I don't know what else to say about your result.

838

The first two prime numbers add up to another prime number.