Number is prime

OSCC · JavaScript, Math, Algorithm · Jan 12, 2021

Checks if the provided integer is a prime number.

  • Check numbers from 2 to the square root of the given number.
  • Return false if any of them divides the given number, else return true, unless the number is less than 2.
const isPrime = num => {
  const boundary = Math.floor(Math.sqrt(num));
  for (let i = 2; i <= boundary; i++) if (num % i === 0) return false;
  return num >= 2;
};
isPrime(11); // true

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