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Q: Is the sum of two composite numbers also composite?

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The three composite numbers are 28, 30 and 32. Their sum is 90.

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.

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

No, they are not. You can add two composite numbers, 15 and 14 for example, and get a sum, 29, that is prime.

Not always, for example 2 + 3 = 5 where 5 is also a prime number.

Related questions

The three composite numbers are 28, 30 and 32. Their sum is 90.

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.

composite

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

No, they are not. You can add two composite numbers, 15 and 14 for example, and get a sum, 29, that is prime.

Not always, for example 2 + 3 = 5 where 5 is also a prime number.

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4nd 9.

65 and 77

21 and 32

Since 4 and 28 are composite numbers, then any of their multiples are also composite.

Yes, of course. In fact the product of any two numbers is composite unless one of them is 1.