# How to Find Prime Numbers in JavaScript?

You can find prime numbers in JavaScript by using a loop to iterate over the numbers, and checking if they are divisible by any number less than themselves. If a number is not divisible by any other number, it is considered to be a prime number.

Here’s an example implementation:

``````function isPrime(num) {
if (num <= 1) {
return false;
}

for (let i = 2; i < num; i++) {
if (num % i === 0) {
return false;
}
}

return true;
}

for (let i = 2; i <= 100; i++) {
if (isPrime(i)) {
}
}

// Output: [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97]``````

This code defines the `isPrime()` function, which takes a number as an argument and returns `true` if the number is a prime number, and `false` otherwise. The `isPrime()` function uses a loop to iterate over the numbers from 2 to `num-1`, and checks if `num` is divisible by any of them. If `num` is divisible by any of them, it returns `false`. If the loop completes without finding any divisors, `num` is considered to be a prime number and the function returns `true`.

The code then uses another loop to iterate over the numbers from 2 to 100, and calls the `isPrime()` function for each number. If the `isPrime()` function returns `true`, the number is added to the `primeNumbers` array.

Note that this is just one implementation, and there are many other ways to find prime numbers, including more efficient algorithms.