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How to check whether a number is Prime or not?

Example

                                        

function IsPrime($n) {

for($x=2; $x<$n; $x++)

{

if($n %$x ==0) {

return 0;

}

}

return 1;

}

$a = IsPrime(3);

if ($a==0)

    echo 'Its not Prime Number.....'."\n";

else

    echo 'It is Prime Number..'."\n";

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