# Program to check for given number is prime or not

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```#include<stdio.h>
#include<conio.h>
void main()
{
int n,i,t=0;  /* t is using flag, during process if any number divides n, then
t changes to 1 */
clrscr();
printf("\n enter n\n");
scanf("%d",&n);
if(n<=1)
printf("\n %d is not a prime number\n",n);
else
{
for(i=2;i<=n/2;++i)
{
if(n%i==0)
t=1;
}
if(t==0)
printf("\n %d is prime number ",n);
else
printf("\n %d is prime number ",n);
}
getch();
}
Output 1:
enter n
5
5 is prime number
Output 2:
enter n
68
68 is not prime number```

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