C Program to find prime number

What is prime number?

Definition of prime number

A number is considered as prime number when it satisfies the below conditions.It should be whole number
- It should be greater than 1
- It should have only 2 factors. They are, 1 and the number itself.

For Example:

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

#include <stdio.h>

int main()

{

int i, num, p = 0;

printf(“Please enter a number: \n”);

scanf(“%d”, &num);

for(i=1; i<=num; i++)

{

if(num%i==0)

{

p++;

}

if(p==2)

{

printf(“Entered number is %d “\

“and it is a prime number.”,num);

}

else

{

printf(“Entered number is %d “\

“and it is not a prime number.”,num);

}

Output:

Please enter a number: 17
Entered number is 17 and it is a prime number.