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No

21 isn't (= 3 x 7)

51 isn't (= 3 x 17)

81 isn't ( = 9 x 9)

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Q: Are all numbers ending in 1 prime?
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Related questions

What prime numbers remain prime numbers when their tens are changed?

All prime numbers ending in 1, 3, 7 or 9. For example, 31 and 71 23 and 43 17 and 47 19 and 79.


Are 35 and 105 relativley prime?

No. To be relatively prime, numbers have to have a GCF of 1. Numbers ending in 5 are divisible by 5.


Are 35 and 105 relatively prime?

No. To be relatively prime, numbers have to have a GCF of 1. Numbers ending in 5 are divisible by 5.


What are all the prime numbers 1-150?

What are prime numbers from 1-150?


Is 144 a prime number?

No a prime number can only be divided by 1 and itself. 144 is an even number, all even number can be divided by 2 (144/2=72) so no even numbers can be prime numbers.


What two numbers have 1 as there gcf?

Prime and relatively prime numbers all have a GCF of 1.


Which are the prime numbers with 1 as the common factor?

All prime numbers have a common factor of 1.


What are all the prime numbers from 1-4?

The prime numbers from 1 to 4 are 2 and 3.


Sum of the all prime numbers within 1 to 100?

The sum of the all prime numbers from 1 to 100 is 1,161


What are all the prime numbers from 1-1?

1 is not a prime number (or composite).


What are all the prime numbers from 1-3?

The prime numbers from 1 to 3 are 2 and 3.


Are 1 31 41 61 prime numbers?

All are prime numbers except 1. 1 is neither prime nor composite.