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21 yes, 31 no.
Wiki User
∙ 7y ago
Wiki User
∙ 7y agoNo, only one of them is.
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Is 21 and 31 a prime number?
21 is composite number that is a multiple of 3. 31 is a prime number.
Is these prime or composite or neither 15 21 31 26 61?
31 and 61 are prime, the rest composite.
Are 21 and 31 composite numbers?
21 is composite as 3 times 7 is 21 31 is prime
What is the composite number for 21?
The only composite factor of 21 is 21.
Is 21 a prime number of composite?
21 is a composite number
What are the composite numbers between 21 and 31?
The composite numbers between 21 and 31 are: 21 22 24 25 26 27 28 30
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.
Which number is prime out of 91 51 31 21?
21 is divisible by 3 and 7, so it is composite. 91 is divisible by 7 and 13, so it is composite. 51 is divisible by 3 and 17. 31 is divisible by only 1 and itself, so it is the prime number.
What is the composite of 21?
A composite number is a number that has more than two factors. The factors of 21 are 1, 3, 7, and 21. Therefore, 21 is a composite number.
What is the next composite number after 20?
The next composite number after 20 is 21.
Which is a composite number 19 21 23?
21 is composite.
Which number is a composite number 93 47 67 or 31?
93 is composite.
