# What is Prime Number?

A prime number has two factors only, first is 1 & other itself

**Prime Number**.## 1.) Examples of Prime Numbers

2, 3, 5, 7, 11, 13, 17, 23, etc. All the numbers have factors 1 or itself number.

## 2.) List of Prime Number from 1 to 100

There are twenty-five Prime Number from 1 to 100

2, 3, 5, 7, 11, 13, 17, 23, 29, 31, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

## 3.) How many Even Prime Numbers?

Two(2) is only Even Prime Number. All other Prime Numbers are odd.

## 4.) What are Co-prime numbers?

Pair of numbers which have only 1 as a common factor is known as co-prime numbers.

Example- 12 & 13 are both co-prime numbers but why? Let's discuss-

Factor of 12 = 1, 2, 3, 4, 6, 12

Factor of 13 = 1,13

We can see 12 & 13 have only 1 as a common factor so they both are co-prime numbers.

## 5.) How to find Prime Numbers?

For identifying any prime number we do factors of that number.

If we get only two factors of that number then it will be a prime number otherwise it will be a composite number.

As below discussion -

*15 - Factors of 15 are 1, 3, 5, 15. Here we get more than two factors of 15 so it will not prime number.*

*97 - Factors of 97 are 1, 97. Here we get only two factors so it will be a prime number.*

## 6.) Is Prime Number have any divisor?

Yes, Prime Number have two divisors 1 & itself number.

Example:-

37 = Factors of 37 are 1 & 37 so both are the divisor of 37.

41 = Factors of 41 are 1 & 41 so both are the divisor of 41.