checknumprime

To check if a number is prime. Make sure you give a number under 4294967295 It, however, does only accept 1 as a prime IF you feed true as the 2nd argument. By default it returns 1 and -1 as NOT prime. Maximum accepted number is Number.MAX_SAFE_INTEGER (9007199254740991) and the Minimum is Number.MIN_SAFE_INTEGER (-9007199254740991).

Node.js:

npm package: npm install checknumprime

var isPrime = require("checknumprime").isPrime;
isPrime(2); //true
isPrime(9); //false
isPrime(1); //false
isPrime(1, true); //true
isPrime(-1); //false
isPrime(-1, true); //true

Browser:

<script src="https://cdn.rawgit.com/PgBiel/checknumprime/master/main.js"></script>

then

//isPrime gets defined in window
isPrime(2); //true