How to check whether a number is prime or not?
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Answer / Suresh Kumar Patel
A prime number is a positive integer greater than 1 that has no positive divisors other than 1 and itself. Here's a simple PHP function for checking if a given number is prime:
```php
function is_prime($num) {
if ($num <= 1) {
return false;
}
for ($i = 2; $i < sqrt($num); $i++) {
if ($num % $i === 0) {
return false;
}
}
return true;
}
```
This function checks all numbers up to the square root of the input number (since a larger factor of the number would be smaller than its square root) and returns `true` if the number is prime, otherwise `false`.
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