Multiples are really just extended times tables. The multiples of 2 are all the numbers in the 2 times table, such as 2, 4, 6, 8, 10 and so on. The multiples of 5 are all the numbers in the 5 ...

A prime number has exactly two factors, itself and one. The first ten prime numbers are \({2}\), \({3}\), \({5}\), \({7}\), \({11}\), \({13}\), \({17}\), \({19 ...