Can sum of 2 composite numbers be prime?
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Can sum of 2 composite numbers be prime?
Answer is true, for an example take two composite no 8 and 9. Even the sum is 17, which is a prime number. Even composite number can be written as a product of primes.
What two composite numbers make a prime number?
A composite number has more than two factors. The number 1 is neither prime nor composite. The prime numbers between 2 and 31 are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29 and 31 since each of these numbers has only two factors, itself and 1….Definitions.
| factors of 2: | 1 x 2 | 2 is prime |
|---|---|---|
| factors of 9: | 1 x 9, 3 x 3 | 9 is composite |
Is the sum of 2 prime numbers always a prime number?
Correct answer: The sum of two primes is always even: This is only true of the odd primes. 2 is also a prime number, however, and 2 plus an odd number is odd. Because 2 is the only even prime, all other primes must have at least one number in between them (since every two odd numbers are separated by an even).
Are 2 and 3 composite numbers?
Likewise, the integers 2 and 3 are not composite numbers because each of them can only be divided by one and itself. Every composite number can be written as the product of two or more (not necessarily distinct) primes.
Can sum of prime numbers be prime?
So, the sum of primes other than 2 is an even number. So, the obtained even number is not a prime. In this case, we can say that the sum of primes cannot be a prime.
Why is 87 not a prime number?
No, 87 is not a prime number. The number 87 is divisible by 1, 3, 29, 87. Since 87 has more than two factors, i.e. 1, 3, 29, 87, it is not a prime number.
How many prime numbers are even?
2
Even prime number: The only even prime number is 2. All other even numbers can be divided by 2 so other even numbers will have three factors as 1 , 2 and themselves so there is only one even prime number.
What are the prime numbers and composite numbers?
Prime numbers are considered as the numbers which retain only two factors i.e. one and itself. It implies that the number can be divided only by 1 and itself. All prime numbers are an odd number apart from 2. Composite numbers are those numbers that retain more than two factors.