Q: Can two prime numbers equal a prime number?

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There are no two prime numbers that equal 121. 121 is not a prime number itself, but is a product of 11*11.

When you multiply two prime numbers together they become factors of the number that they equal. Since the number will have factors other than 1 and itself, the number cannot be prime.

For two numbers to equal an odd number, you need one to be even and the other odd. In this case, we want both to be prime. The only even prime number is 2. Therefore, the other number must be 23. This is prime, and so yes, 2 prime numbers can equal 25, however 2 and 23 are the only possible pair.

19 and 11 are the two prime numbers that equal to 209.

I'm sure there are more than 2 prime numbers that are 400 digits long.

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There are no two prime numbers that equal 121. 121 is not a prime number itself, but is a product of 11*11.

When you multiply two prime numbers together they become factors of the number that they equal. Since the number will have factors other than 1 and itself, the number cannot be prime.

101 is a prime number.

There is only one number that equals 400. The number is 400, and it's not a prime number.

the two prime numbers will be factors of that number, which would make that number a composite number

They are: 1*59 = 59 which is a prime number

For two numbers to equal an odd number, you need one to be even and the other odd. In this case, we want both to be prime. The only even prime number is 2. Therefore, the other number must be 23. This is prime, and so yes, 2 prime numbers can equal 25, however 2 and 23 are the only possible pair.

19 and 11 are the two prime numbers that equal to 209.

No two prime numbers satisfy that request.

I'm sure there are more than 2 prime numbers that are 400 digits long.

If one of the two numbers is 2, the sum of two prime numbers may sometimes be a prime number. Examples of this are 2 + 11 = 13, 2 + 521 = 523, 2 + 281 = 283. There are an infinite number of similar examples where the sum of 2 plus a prime is another prime. However if neither number is 2, then the sum of two prime numbers is always an even number greater than 2 and therefore composite.

There are two prime numbers that equals 50. The two numbers are 13 & 37. Both numbers are prime, so that's the answer.