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You appear to asking about numbers such as 15, 25, 35, etc. If this is the case, all of these numbers are divisible by more tham themselves and one. Prime numbers are divisible by only two factors.
Issac Crist
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Why numbers with a five in the ones place are not prime numbers?
All but the number five are multiples of 5.
Other than5 are there any prime numbers with 5 in the ones place?
No, any number with a 5 in one's place would be divisible by 5.
Why number with a 5 in the ones place are not prime numbers?
Except for 5, all of them have more than two factors.
How can you tell 32 and 95 are not prime numbers without finding their factors?
32 is an even number (look at the ones place). The only even prime is 2. 95 has 5 as a factor (again look at the ones place). Multiples of 5 have a 0 or 5 in the ones place.That is how you figer out if 32 and 95 in not a prime number.
What is the ones place value of the product of the first 51 prime numbers?
It is 0. Two of the first 51 prime numbers are 2 and 5, whose product is 10. When you multiply 10 by any other whole numbers, the final digit (in the ones place value) will be 0.
How many positive prime numbers have a ones digit of 5?
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
Is it true or false that all numbers with a 0 in the ones' place are composite numbers?
It is true (as long as there are no decimal places after the ones place) because those numbers will always be divisible by 2, 5, and 10. With exception of the number zero which is neither prime nor composite.
What numbers are relatively prime to 5?
Since 5 is a prime number, then any number, which is not a multiple of 5, is relatively prime with the number 5. You can determine if a number is a multiple of 5, by looking at the ones place digit. If it is a 0 or 5, and the number itself is not zero, then the number is a multiple of 5.
What about the ones place in odd numbers?
The ones place in odd numbers will be odd (1, 3, 5, 7, 9)
What are the only 4 possibilities for the ones-place digits of all primes greater than 5?
The possibilities for a digit in the ones place of a prime number greater than 5 are 1, 3, 7, and 9. If a 0, 2, 4, 6, or 8 is in the ones place, the number is divisible by 2, so it would not be prime. If a 5 is in the ones place, the number is divisible by 5, so it would not be prime.
1 45 5 9 15 3 what ones are prime numbers?
1, 5, and 3
What is the ones digit in the product of all the prime numbers less than 2012?
The ones digit in the product from multiplying the 305 prime numbers less than 2012 is 0 because the ones digit becomes 0 after 2 and 5 have been multiplied and remains unchanged after more prime numbers are multiplied.
