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the clue is that one of the factors must be <= square root(N). So, you know one number must be <=7 and there are only 4 possible primes that are eligible. They are 2,3,5 and 7. Because 51 is odd, we toss out 2. The number 5 only evenly divides into numbers ending in 0 or 5, so we can toss out 5.
Then, the numbers are either 3*(51/3) or 7*(51/7). Only one of the expressions in parentheses is also a Prime number. This gives your answer for the pair.
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∙ 15y ago
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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.
Is the product of two prime numbers composite or prime?
The product of two prime numbers will be composite.
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.
All prime numbers except for 2 are odd?
All of the prime numbers are odd except for two.
Which pair of numbers has an odd product and an even sum?
Any two odd numbers will have an odd product and an even sum.
Is it possible for the product of two prime numbers to be odd?
More than possible. Unless one of your prime numbers is 2, the product of any other two will be odd.
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.
Is the product for any two prime numbers always odd?
Without knowing what the product is, it will be difficult to help. Presumably, you can tell the difference between even and odd numbers. If you are trying to predict, the product of two evens is even, the product of two odds is odd and the product of an even and an odd is even.
What are the two odd prime numbers of 85?
As a product of its prime factors: 5*17 = 85
What is the product of two odd numbers?
The product of two odd numbers is always an odd number.
Is the product of two odd numbers odd or even?
The product of two odd numbers is always odd.
What are two odd numbers that make the product of an even number?
No such numbers exist; the product of two odd numbers is always odd.
What 2 consecutive odd numbers when added together equal the product of the 1st and 4th prime number?
The product of the first and fourth prime numbers (2 x 7) is 14. No two consecutive odd numbers add up to 14.
Is the product of any two prime numbers aways odd?
No. 2 x 5 = 10
Is the product of two prime numbers composite or prime?
The product of two prime numbers will be composite.
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.
All prime numbers except for 2 are odd?
All of the prime numbers are odd except for two.
