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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