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21 is not a prime.

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โˆ™ 2016-05-03 16:05:36
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Factoring and Multiples

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โˆ™ 2016-05-10 01:16:10

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Q: Which of these numbers is not a prime number A 21 B 31 C 41?
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Related questions

What number is a prime number 21 31 41?

31 and 41 are prime numbers because they have only two factors


What numbers are prime numbers out of 21 31 41?

21


Is 21 and 31 a prime number?

21 is composite number that is a multiple of 3. 31 is a prime number.


Which of 21 31 51 and 91 is a prime number?

31 is a prime number.


What number is a prime number 91 51 31 21?

31 is prime.


What are the prime numbers from 21 to 40?

The prime numbers from 21 to 40 are 23, 29, 31, and 37.


What is the prime numbers between 21 and 33?

there are 3 prime numbers in between 21 and 33... they are 23,29, 31.


How many prime numbers do 31 have?

31 is a prime number. Its only prime factor is 31.


How many prime numbers are there from 21 to 35?

There are 3 prime numbers from 21 to 35:23, 29 and 31


Is 31 a prime?

Yes, 31 is a prime number. If you Google "Prime Numbers", you can see a chart of all the prime numbers.


Are 21 and 31 composite numbers?

21 is composite as 3 times 7 is 21 31 is prime


Which number is a prime number 91 or 51 or 31 or 21?

31


What are the prime numbers between 21 and 40?

The prime numbers between 21 and 40 are: 23 29 31 37.


What are the prime numbers between 21 and 39?

The numbers 23, 29, 31 and 37 are prime.


Which number is a prime 91 51 31 or 21?

31


Which is a prime number 91 51 31 21?

31


Which number is prime 91 51 31 21?

31


What are the prime numbers from 21 to 32?

They are: 23, 29 and 31


What numbers go evenly into 31?

1 and 31 (31 is a prime number).


Which one of these numbers is a prime number 15 21 27 31 33?

It is 31 because it has only two factors which are itself and one


Is the addition of two composite numbers also a composite number?

Not necessarily. For example 15 and 16 are composite numbers. They add to 31, which is a prime number. Similarly, the composite numbers 20 and 21 add up to 41, which is a prime number.


What are the prime numbers between 21 and 35?

23, 29 and 31


What are the prime numbers 21 to 40?

23 29 31 37.


What are the prime numbers between 21 and 32?

23 29 31.


What are 2 numbers that you can multiply to get 31?

62