Number is prime
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 returntrue
, unless the number is less than2
.
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