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.