49 has the factors 1, 7 and 49. The factors of a given number are the numbers that divide evenly into it with no residue. One and the actual number in question, 49, are always factors.
The number 49 is a square, meaning that seven multiplied by itself results in 49. Seven is the square root of fifty-nine. Additionally, seven is a prime number, meaning that it is equally divided by just one and itself. Therefore, the prime factorization of 49 is 7 x 7 or 72. The prime factorization of a number is locating the prime numbers that, when multiplied, produce that number.