Best Answer

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

More answers

21 is composite, 19 nd 23 are prime.

Q: Is the numbers 19 21 and 23 a composite number?

Write your answer...

Submit

Still have questions?

Continue Learning about Math & Arithmetic

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.

3, 7, and 19 have only two factors, 1 and itself. They are prime numbers. 21 has more than 2 factors: 1, 3, 7, and 21. It is a composite number.

19. It is prime.

The factors of 21 are 1, 3, 7, and 21. The only factor of 21 that is a composite number is 21.

21 is a composite number, as it can be divided by 7 and 3. The other three numbers are prime numbers and do not divide into anything besides themselves.

Related questions

19 is prime number. 10, 21 and 62 are composite numbers.

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 composite.

3, 7, and 19 have only two factors, 1 and itself. They are prime numbers. 21 has more than 2 factors: 1, 3, 7, and 21. It is a composite number.

19. It is prime.

21 and 22 are consecutive composite numbers.

The factors of 21 are 1, 3, 7, and 21. The only factor of 21 that is a composite number is 21.

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, as it can be divided by 7 and 3. The other three numbers are prime numbers and do not divide into anything besides themselves.

21 is composite. 19 and 23 are prime.

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.

4, 21