2
to the square root of the given number.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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