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Five is the only prime number to end in the digit 5, because all other numbers written with a 5 in the ones-place under the decimal system are multiples of five. Your guide to the number 5, an odd number which is prime. Mathematical info, prime factorization, fun facts and numerical data for STEM, education and fun. Mathematics Five is the third prime number, after two and three, and before seven. The number five is also an odd number. Most people have five fingers (including one thumb) on each hand and five toes.