Write a function to check a number is prime or not.

<?php
function IsPrime($n)
{
  for($x=2; $x<$n; $x++)
  {
    if($n %$x ==0)
    {
      return 0;
    }
  }
  return 1;
}
$a = IsPrime(3);

if ($a==0)
echo 'This is not a Prime Number.....';
else
echo 'This is  a Prime Number..';
?>  

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