Function to check if a number is prime in Javascript

A prime number is a number only divisible by 1 or by itself. For example, 17 is only divisible by 17 or by itself. Thus 2, 3, 5, 7, 11, 13, 17…. are prime numbers.

Note: 0 and 1 are not prime numbers. 2 is the only prime and even number.
 

Program to check if the number is prime or not

function isPrime(nbr) {
  for(var i = 2; i < nbr; i++)
    if(nbr%i === 0) return false;
  return nbr > 1;
}

console.log(isPrime(2));

Output:

true

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