21 is a composite number because it has more than two factors
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31 and 61 are prime, the rest composite.
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.
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.
21 is a composite number
Mathematically, 21 is a composite number because it fails to meet the definition of a prime or neither prime nor composite number. It meets the rule for a composite number.Prime Number - Any number whom's only two factors are one and itself, and is neither 0 nor 1, is prime.Composite Number - Any number with other factors than one and itself, and is neither 0 nor 1, is composite.Neither Composite Nor Prime - Is only 0 and 1.