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javascript/snippets/is-prime.md

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+---
+title: Number is prime
+type: snippet
+tags: [math,algorithm]
+cover: thread
+dateModified: 2021-01-12T19:36:36+02:00
+---
+
+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`.
+
+```js
+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;
+};
+```
+
+```js
+isPrime(11); // true
+```