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Q: Are 21 and 31 composite numbers?

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The composite numbers between 21 and 31 are: 21 22 24 25 26 27 28 30

4, 21

31 is not composite.

7, 31, 103 All three are prime numbers and not composite numbers.

There are no composite numbers between 30 and 31. 30 and 31 are consecutive numbers with no whole numbers between them.

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.

23, 29 and 31 are prime. The rest are composite.

No, they are three numbers, not one. 21 is composite.

21 yes, 31 no.

31, 37, & 41 are prime; 32,33,34,35,36,38,39 & 40 are composite.

The they are.

31 and 61 are prime, the rest composite.

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