Java tutorial
//package com.java2s; //License from project: Apache License public class Main { public static boolean isPrime(int number) { if (number == 1) return false; if (Math.abs(number) == 2) return true; if (number % 2 == 0) return false; for (int i = 3; i * i <= number; i += 2) { if (number % i == 0) return false; } return true; } }