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Odd prime numbers under 15 are prime numbers that are greater than 2 and do not have any factors other than 1 and themselves. The odd prime numbers under 15 are 3, 5, 7, 11, and 13. These numbers cannot be divided evenly by any other number except 1 and themselves, making them prime.
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Are all odd numbers prime numbers?
No because 2 is an even number which is also a Prime number that has only two factors which are itself and one.
What is a counter example for the statement that all odd numbers are prime?
9 = 3 x 3 15 = 3 x 5 etc. Any odd number that is composite. But 2 is a prime number which is not an odd number. [Wrong question: that is a counter example to all primes are odd numbers]
What odd number between 11 and 21 is the product of two prime numbers?
13 is prime so it is not the number. 15 is the product of 3 and 5, two prime numbers, so it fits the conditions. 17 is prime so it is not the number. 19 is prime so it is not the number. 15 is the only odd number between 11 and 21 that fits the conditions. However, if 21 is included in the range, it also is the product of two prime numbers: 3 x 7.
What number less than 20 an odd number and has 2 different prime factors?
Well, darling, the number you're looking for is 15. It's less than 20, odd, and can be broken down into the prime factors 3 and 5. So, there you have it, a prime factor party with the number 15 strutting its stuff.
What odd number less than 20 has 2 different prime factors?
The smallest prime numbers, after 2, are 3 and 5. 3 x 5 = 15.
