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# Are these numbers prime or composite 21?

Updated: 4/28/2022

Wiki User

7y ago

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.

Wiki User

12y ago

Wiki User

7y ago

composite

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Q: Are these numbers prime or composite 21?
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Related questions

### Is the numbers 19 21 and 23 a composite number?

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

### Is 7 and 3 and 21 prime numbers?

7 and 3 are prime numbers but 21 is a composite nuber

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### Is 10 19 21 62 composite numbers?

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

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yes as they are not prime numbers

### What prime numbers 21?

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.

### How many composite numbers are there from 101 to 200?

Out of those 100 numbers, 21 of them are prime numbers, so the remaining (100 - 21) = 79 are composite.

### Is this number prime or composite 21?

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.

### What are the factors of 21 is it composite or prime?

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.

### Is the addition of two composite numbers also a composite number?

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.

21 is composite.

### What is a composite number 21 55 77 93 23?

21, 55, 77, and 93 are composite numbers. 23 is a prime.