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Is the product of any two prime numbers is always odd?
No, because 2 is prime. Otherwise the product of two odds is odd, and all primes are odd except 2.
What do 3 5 7 11 and 13 have in common?
They are all odd, and they are all prime numbers
All prime numbers except for 2 are odd?
All of the prime numbers are odd except for two.
Is a prime number always an odd number?
Except for 2 all other prime numbers are odd. Otherwise, they would be divisible by 2 (and thus not a prime number). This does NOT mean that all odd numbers are prime, but that all prime numbers (aside from 2) are odd.
When multiplying an odd number by an odd number why is the result odd?
The product of multiplication results in a number that has all of the factors of the two numbers being multiplied. All even numbers have the prime factor 2. Since no odd number has the factor 2, no product of those numbers can have it. So: - Odd numbers times odd numbers produce odd numbers. - Odd numbers times even numbers produce even numbers. - Even numbers times even numbers produce even numbers.
