Input
Output
<?php // Define the number to check $number = 29; $isPrime = true; // 0 and 1 are not prime if ($number <= 1) { $isPrime = false; } else { // Check divisibility from 2 to sqrt(number) for ($i = 2; $i <= sqrt($number); $i++) { if ($number % $i == 0) { $isPrime = false; break; } } } // Display the result if ($isPrime) { echo "$number is a Prime Number."; } else { echo "$number is NOT a Prime Number."; } ?>