# Check Number is Prime or not?

## JavaScript

### Function that determines whether a number is prime:

create a function to determine whether a number is prime by checking whether it's divisible by any number other than 1 and itself. Here's a JavaScript function to do that:

js Copy Code
```function isPrime(number) {
// Numbers less than or equal to 1 are not prime
if (number <= 1) {
return false;
}

// Check divisibility starting from 2 up to the square root of the number
for (let i = 2; i <= Math.sqrt(number); i++) {

/*If the number is divisible by any number other than 1,
and itself, it's not prime*/

if (number % i === 0) {
return false;
}
}

// If no divisor is found, the number is prime
return true;
}

// Example usage:
console.log(isPrime(5));  // Output: true
console.log(isPrime(8));  // Output: false```
Output:
```true
false```

Explanation:

This function first checks if the number is less than or equal to 1, in which case it returns 'false' since prime numbers are defined as integers greater than 1. Then, it iterates from 2 up to the square root of the number, checking for divisibility. If the number is divisible by any integer in that range, it returns 'false'. If no divisor is found, it returns 'true', indicating that the number is prime.

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