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Check if number is prime.
Similar: properDivisors, primeFactors, primeExponentials, isPrime.
function isPrime(x) // x: a number
const xnumber = require('extra-number'); xnumber.isPrime(7); // → true xnumber.isPrime(53); // → true xnumber.isPrime(4); // → false xnumber.isPrime(1); // → false xnumber.isPrime(0); // → false