Prime Number Test

[jacksparrow]

Hi
Got 2 errors
the program should let me enter number and check whether its a prime or not


Error 1 error C2668: 'sqrt' : ambiguous call to overloaded function c:\users\hani\test4\test4\code.cpp 15

Error 2 fatal error C1903: unable to recover from previous error(s); stopping compilation c:\users\hani\test4\test4\code.cpp 15

# include <iostream>
# include <cmath>
using namespace std;

int main () { 

    int n;
    int i;
    int is_prime=true;

    cout << " enter a number ";
    cin >>n;

    i = 2;
    while ( i <= sqrt(n)) {
        if ( n % i ==0)
            is_prime = false;
        i++;
    }

    if ( is_prime )
        cout << " the number is prime "<<endl;
    else
        cout << " is not prime number "<<endl;

system ("PAUSE");
return 0;

}