21 is a Composite Number.
A Prime number is a whole number that only has two factors which are itself and one. A composite number has factors in addition to one and itself.
21 is divisible by 3 and 7.
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∙ 10y agoWiki User
∙ 12y agoFactors of 21 are 1, 3, 7, and 21. 21 is a compositenumber because it has more factors than just 1 and itself.
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∙ 11y agoIt is composite because it has more than two factors
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∙ 11y agoIt is composite because it has more than 2 factors
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∙ 11y agoComposite, 21=3*7
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∙ 12y agoComposite
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∙ 8y agoComposite.
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Prime
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prime
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No
number 21 is prime
21 is a composite number, not a prime, having prime factors 3x7.
Who says it is? 21 is a composite number!
21 is composite number that is a multiple of 3. 31 is a prime number.
19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.
21 is a composite number
number 21 is prime
21 is a composite number, not a prime, having prime factors 3x7.
Who says it is? 21 is a composite number!
21 is a composite number.
21 is a composite number.
3 * 7 = 21 21 is not prime
21 is composite number that is a multiple of 3. 31 is a prime number.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 21 is composite.
19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.
A prime number is any integer evenly divisible by only itself, and the number 1. Since 21 is divisible by 3 and 7, it is a composite number, not a prime number.No, 21 is not a prime number.21 is divisible by 1, 3, 7, & 21No. 21=3*7
21 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.