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Check Prime Number: Write a PHP function to check if a given number is prime or not.

function isPrime($n) {
    if ($n <= 1) {
        return false;
    }
    for ($i = 2; $i <= sqrt($n); $i++) {
        if ($n % $i == 0) {
            return false;
        }
    }
    return true;
}

// Example usage:
$number = 17;
if (isPrime($number)) {
    echo "$number is a prime number.";
} else {
    echo "$number is not a prime number.";
}

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