Official lyric video for “Fifteen” (Taylor’s Version) – off her Fearless (Taylor’s Version) album. Get the album here: . Music video by Taylor Swift performing Fifteen. The meaning of the number 15: How is 15 spell, written in words, interesting facts, mathematics, computer science, numerology, codes. 15 in Roman Numerals and images. Number 15 is the number of the Magic Square. The magic square has been used in magic and as a talisman in many cultures around the globe for centuries. In Asia the magic square is called Lo Shu and is used to this day as a tool in feng-shui. 15 (fifteen) is the number that comes after 14 and before 16. 15's prime factorization is 3*5, and its factors are 1, 3, 5, and 15. It is the second composite odd number, after 9. Fifteen or 15 may also refer to: This disambiguation page lists articles associated with the same number. If an internal link led you here, you may wish to change the link to point directly to the intended article. 15 (fifteen) is a number. It is between fourteen and sixteen, and is an odd number. It is divisible by 1, 3, 5, and 15. In Roman numerals, 15 is written as XV. This short article about mathematics can be made longer. You can help Wikipedia by adding to it. In decimal, 15 contains the digits 1 and 5 and is the result of adding together the integers from 1 to 5 (1 + 2 + 3 + 4 + 5 = 15). The only other number with this property (in decimal) is 27. Get the latest in-depth stories and breaking news from ABC15 Arizona in Phoenix. Arizona’s source for breaking news, weather, traffic and in-depth investigations from ABC15 Arizona in Phoenix.