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Not always as for example 20+9 = 29 which is a Prime number
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Earn +20 ptsQ: Is the sum of two composite numbers also composite?
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What is the sum of 28 and the next two consecutive composite numbers?
The three composite numbers are 28, 30 and 32. Their sum is 90.
Is the sum of any two prime numbers always a composite 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.
If you add a prime number to itself is the the sum composite or prime?
The sum of two prime numbers will be composite unless one of the prime numbers is 2.
Are composite numbers closed under addition?
No, they are not. You can add two composite numbers, 15 and 14 for example, and get a sum, 29, that is prime.
What two composite numbers whose prime factors have a sum of 10?
4nd 9.
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