Is 22 prime or composite??

2 Answers
May 7, 2018

22 is composite.

Explanation:

First, review what "prime" and "composite" mean:

A prime number is number greater than 1 that can't be created by multiplying two smaller, natural numbers.

A composite number is a number greater than 1 that can be created by multiplying two smaller, natural numbers.

Let's factor 22:

1 - 22
2 - 11

Because 22 can be formed by multiplying two smaller, natural numbers, it is composite.

Source:
https://en.wikipedia.org/wiki/Prime_number

May 9, 2018

2222 is composite because it has four factors.

Explanation:

A Prime number has only 22 factors - 11 and itself.

The only even number which is prime is 22, since 2 = 1 xx 22=1×2
All other even numbers are multiples of 22 and therefore have 22 as a factor.

22 = 1xx22 " " and 22 = 2xx1122=1×22 and22=2×11
Therefore we can see it has 44 factors and cannot be prime, it is composite.

Numbers which have more than 22 factors are composite numbers,

11 is neither prime nor composite since it has only 11 factor.

The prime numbers less than 3030 are:

2,3,5,7,11,13,17,19,23,292,3,5,7,11,13,17,19,23,29