isPrime javascript Code Snippet in 2025
mathalgorithmbeginner
Last Updated: 1 November 2025
Checks if the provided integer is a prime number.
- Check numbers from
2to the square root of the given number. - Return
falseif 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); // truejavascript snippet similar to isPrime For You in November 2025
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