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5 . 5 (five) is a number, numeral and digit. It is the natural number, and cardinal number, following 4 and preceding 6, and is a prime number. Humans, and many other animals, have 5 digits on their limbs. 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.