In C programming Write a function that returns 1 if its argument is a prime number and returns zero otherwise?

#include<iOStream.h>

int CheckPrime(int number){

for(int i=2;i<number;i++){

if(number%i==0)

return 0;

}

return 1;

}

void main()

{

int num=7;

cout<<CheckPrime(num);

}