Factors of 15: The number 15 is a composite

The number 15 is a composite number because 15 can be divided by one, by itself and at least by 3 and 5. A composite number is an integer that can be divided by at least another natural number, besides itself and 1, without leaving a remainder (divided exactly). The factorization or decomposition of 15 = 3•5. Notice that here, it is written in exponential form. The prime factors of 15 are 3 and 5. It is the list of the integer's prime factors. The number of prime factors of 15 is 2. Learn how to find the factors of 15 by division method and prime factorization. The factors of 15 are 1, 3, 5, and 15, and the prime factorization of 15 is 3 × 5. It has a total of 4 factors of which 15 is the biggest factor and the positive factors of 15 are 1, 3, 5, and 15. The sum of all factors of 15 is 24 and its factors in Pairs are (1, 15) and (3, 5). Discover all factors of 15, their pairs, and prime factorization. Learn easy methods and tips to solve exam questions fast.