Multiple of any number is a number which can be divided exactly by that number. The Multiples of a number are formed by multiplyng it with other numbers like 1,2,3,etc. A number can have unlimited multiples. Example: 10,15,20,25,30, ... are multiples of 5. Facts About Multiples: Each number is a multiple of itself. Every number is a multiple of 1. Prime Number Program in Java. Prime number in Java: Prime number is a number that is greater than 1 and divided by 1 or itself only. In other words, prime numbers can't be divided by other numbers than itself or 1. For example 2, 3, 5, 7, 11, 13, 17.... are the prime numbers. Note: 0 and 1 are not prime numbers. A number is divisible by 11 if the difference between the sum of the digits at odd place and the digits at even place is either 0 or divisible by 11. In, the given number 68415 Sum of the digits at even places: 1 + 8 = 9 Sum of the digits at odd places: 5 + 4 + 6 = 15 The crucial importance of prime numbers to mathematics in general stems from the fundamental theorem of arithmetic, which states that every integer larger than 1 can be written as a product of one or more primes in a way that is unique except for the order of the prime factors.