Check the number is prime or not in swift 3.0

//code

import UIKit

var flag=0

var n = 13

var i = 2

for i in 2 ... n-1

{

    if(n%i==0)

    {

        flag = 1;

        break;

    }

}

if(flag==1)

{

    print("\(n)" + " is not prime")

}

else

{

    print("\(n)" + " is  prime")

}

Result: