They are both composite numbers because they have more than 2 factors
The only composite factor of 21 is 21.
21 is a composite number
The next composite number after 20 is 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.
21 is composite.
21 is composite number because it has more than one number that goes into it
21 and 28 are composite.
The first composite number greater than 21 is 22.
21 is the composite number because it's an odd number. 2 cannot be a composite number because it's even.
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.
number 21 is prime
Who says it is? 21 is a composite number!