Finding factors of a number, Identify Prime and Composite number

function findFactors(dividend) { var factors = [1, dividend]; var quotient = Math.min(); var divisor = 2; while(divisor < quotient) { quotient = dividend / divisor; if(Number.isInteger(quotient)) { factors.push(quotient, divisor); } divisor++; } return factors; } function isPrime(number) { return findFactors(number).length === 2 } var num = 5; var factors = findFactors(num); console.log(factors.length + " factors found (" + factors.sort((a, b) => a-b) + ")"); console.log(isPrime(num) ? "It's a prime number" : "It's a composite number"); var num = 72; var factors = findFactors(num); console.log(factors.length + " factors found (" + factors.sort((a, b) => a-b) + ")"); console.log(isPrime(num) ? "It's a prime number" : "It's a composite number");