## Prime or Not – C Program

### Write a c program for check the inputted number is prime or not.

The prime number is divisible only by itself, and the rest of all numbers are composite.

Here is the c program for check the given number is prime or not using for loop.

```
#include<stdio.h>
#include<conio.h>
void main()
{
int n, a = 2;
printf("Enter the number for check prime or not : \n");
scanf("%d",&n);
for (a = 2 ; a <= n - 1 ; a++)
{
if (n%a == 0)
{
printf("The number %d is not prime.\n", n);
break;
}
}
if (a == n)
{
printf("The number %d is prime.\n", n);
}
}
```

The out put of check prime number c program is :

```
Enter the number for check prime or not :
100
The number 100 is not prime.
//////////
Enter the number for check prime or not :
11
The number 11 is prime.
```