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If you multiply two prime numbers, the product (result) will be a composite number, not a Prime number. A prime number has exactly two factors, 1 and itself. The product of two prime numbers will have those two numbers as factors, as well.

The sum of two prime numbers might be prime if one of those two numbers is 2, the only even prime number, but otherwise it will not be a prime because two odd numbers will have an even sum, which means it is divisible by 2.

Examples:

2 + 3 = 5 (prime)

3 + 7 = 10 (not prime)

13 + 17 = 30 (not prime)

If you multiply two prime numbers, the sum of the digits of the product might or might not be prime.

Examples:

2 x 7 = 14, sum of digits is 5 (prime)

2 x 11 = 22, sum of digits is 4 (not prime)

3 x 5 = 15, sum of digits is 6 (not prime)

3 x 7 = 21, sum of digits is 3 (prime)

5 x 7 = 35, sum of digits is 8 (prime)

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โˆ™ 2010-06-10 15:12:34
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Related questions

Is there another number with a prime factorization of 64 times 15625?

Every composite number has its own unique prime factorization.


What prime number times another prime number makes 40?

As a product of its prime factors: 2*2*2*5 = 40 or as 23*5 = 40


What is a prime number times a prime number?

A prime number times a prime number is a composite number. Since prime numbers, except for 2, are odd numbers, a prime number times a prime number is usually an odd number. It will only be an even number if one of the prime numbers is 2. A prime number times a prime number will be a number with four factors unless both prime numbers are the same, in which case it will be a square number with only three factors.


What numbers times number another go into 59?

Only 1 and 59 - it's a prime number.


Why is 391 not a prime number?

Because you can not divide it into anything. Another answer: What is 17 times 23?


Prime number is divisible by another prime number?

This is impossible. A prime number is defined as a number that is only divisible by one and itself. Thus, a 'prime' number capable of being divided by another prime number is by definition not a prime number.


Is 11 prime factor?

Yes, 11 is a prime number which can be a prime factor of another number


How do you a number is a prime number?

if the number is not divisible by another number


Is the product of two prime numbers not a prime number?

The product of two prime numbers can never be another prime number, the numbers that you multiplied are factors of the product. (example, 9 times 5 is 45, 9 and 5 go into 45)


Why is 3 a cunsective prime number?

Because it immediately follows another prime number.


Is there another even prime number?

2 is the only known even prime number


What does the prime factorization of a number mean?

It means to be able to times prime numbers to get the number you have.

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