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Q: Is 21 a prime composite or neither number?

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3 * 7 = 21 21 is not prime

Composite

31 and 61 are prime, the rest composite.

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.

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

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.

number 21 is prime

Composite

composite because it has more than two factors.

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.

Composite.

A prime number can only have adivisorof itself and 1.Both 3 and 7 divide 21, so it cannot be a prime number.I.e.: 21/3 = 7 and 21/7 = 3A composite number has at least 1 divisor, and we already determined that both 3 and 7 are divisors, so:21 is a composite number21 is a composite number.

Composite, 21=3*7

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.

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.

23 is prime. 21 is composite as it is 7x3. A prime number has only 2 factors which are 1 and itself. Composite numbers are every other positive integer except 1 and 0. 1 and 0 are neither prime, nor composite.

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.

21 has the factors 21,1,7,3. 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 number that is a multiple of 3. 31 is a prime number.

19 and 23 are prime numbers whereas 21 is a composite number

1 is not composite or prime.