<?php

namespace Calendar\Controller;
 
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Scarlett\Controller\Controller;
use Calendar\Model\LeapYear;
 
class LeapYearController extends Controller
{
    public function indexAction(Request $request, $year)
    {
        $leapyear = new LeapYear();
        if ($leapyear->isLeapYear($year)) {
            $message = 'Yep, this is a leap year!';
        }else{
            $message = 'Nope, this is not a leap year!';
        }
 
        return $this->render('leapYear', array('message' => $message));
    }

    public function primeAction(Request $request, $number)
    {
        $message = "It's prime!";
        for($i=$number-1;$i>=2;$i--) {
            if($number%$i == 0) {
                $message =" It's not prime!";
                break;
            }
        }

        return $this->render('primeNumber', array('message' => $message));
    }
}
<?php

namespace Calendar\Controller;
 
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Scarlett\Controller\Controller;
use Calendar\Model\LeapYear;
 
class LeapYearController extends Controller
{
    public function indexAction(Request $request, $year)
    {
        $leapyear = new LeapYear();
        if ($leapyear->isLeapYear($year)) {
            $message = 'Yep, this is a leap year!';
        }else{
            $message = 'Nope, this is not a leap year!';
        }
 
        return $this->render('leapYear', array('message' => $message));
    }

    public function primeAction(Request $request, $number)
    {
        if($number%$number == 0  && $number%1 == 0){
            $message = 'Prime number';
        }else{
            $message = 'Not prime';
        }

        return $this->render('primeNumber', array('message' => $message));
    }
}
--- 
+++ 
@@ -23,10 +23,12 @@
 
     public function primeAction(Request $request, $number)
     {
-        if($number%$number == 0  && $number%1 == 0){
-            $message = 'Prime number';
-        }else{
-            $message = 'Not prime';
+        $message = "It's prime!";
+        for($i=$number-1;$i>=2;$i--) {
+            if($number%$i == 0) {
+                $message =" It's not prime!";
+                break;
+            }
         }
 
         return $this->render('primeNumber', array('message' => $message));
Add a real prime number test
