Answer Posted / mamoon

#include<iostream.h>
#include <math.h>

void main()
{
int number;
cout<<" --------------------------------------------
-"<<endl;
cout<<" Enter a number to find if its a prime
number "<<endl;
cout<<" --------------------------------------------
-"<<endl;
cin>>number;
bool a =true;

for(int i=2;i<sqrt(number);i++) //check
untill the square root
{

if(number%i==0) // if it is
divisible it is non prime
{
a=false;
break;
}
}


if(a==false)
cout<<number<<" \nis not a prime number"<<endl;
else
cout<<number<<" \nis a prime number"<<endl;

}

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