prime number in c programming

prime number in c programming 

#include<stdio.h>
#include<conio.h>
prime(int n,int i);
void main()
{
int n,a;
clrscr();
printf("number of i:");
scanf("%d",&n);
a=prime(n);
printf("prime=%d",n);
getch();
}
prime(int n,int i)
{
for(i=2;n>1;n++);
{
while(n%i==0)
{
printf("%d",i);
n=n/i;
}
return(prime);
}
}