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The sum of any two prime numbers may or may not be prime. The sum of the two prime numbers 2 and 3 is the Prime number 5, and the sum of the two prime numbers 5 and 7 is the composite number 12.

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Q: When adding 2 prime number will the answer be prime?
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Related questions

Can i make any number that isn't a prime number by adding 2 prime numbers?

No, for example you can't create the number 65, which is not a prime number, by adding any two prime numbers.

When you add 1 to any prime number except 2 you get a number?

Every prime number except 2 is an odd number, so adding 1 to any prime number except 2 results in an even number.

What are the rules for adding two prime numbers to get a prime number answer?

Make sure that one of them is 2.

Is it true that if you add 2 prime numbers you always get an even number?

As long as one of the numbers isn't 2, adding any two prime numbers results in an even number. Why? 1.) Adding any two odd numbers gives an even number, 2.) adding an odd and an even gives an odd, and 3.) all primes are odd, except for 2.

What are two prime numbers whose sum is also prime?

2 + 3 = 5 2 + 5 = 7 2+ 11 = 13 2 + 41 = 43 The numbers only work with 2 because adding odd numbers together equals an even number. 2 is the only even prime number and thus adding any other prime numbers together will not equal a prime.

Can you make a square number from adding two prime numbers?

25 = 23 + 2

What particular significance if any has the number 173?

173 is the 40th prime number and when squared it produces a number with only 2 digits, 29929. It can be obtained by adding the squares of 2 and 13, or by adding the 3 consecutive prime numbers of 53, 59, and 61.

What is the first even number that cannot be formed by adding two prime numbers together?


How do you turn a composite number into a prime?

There is no set formula to make a prime number into a composite but usually adding 1 will work. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1, 2, and 0.

How many district composite numbers can be formed by adding 2 of the first prime numbers?

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

What is the lowest value that can be obtained by multiplying the square root of 169 by a prime number between 50 and 60 and then adding another prime number to it?

13 x 53 + 2= 691

Is it true that the sum of two prime numbers is always an even number?

Not quite.When two prime numbers of 3 and higher are added together, the result is always even, because all such prime numbers are odd numbers, and when two odd numbers are added together, the result is always an even number.However 2 is a prime number, and 2 is also an even number. Adding 2 (an even number) to a different prime number (an odd number) will always yield an odd number.Only if you don't include "2".