# What is a prime factorization 155?

It is: 5*31 = 155

### What are the factors and prime factors of 155?

155 is a composite number because it has factors other than 1 and itself. It is not a prime number. The 4 factors of 155 are 1, 5, 31, and 155. The factor pairs of 155 are 1 x 155 and 5 x 31. The proper factors of 155 are 1, 5, and 31 or, if the definition you are using excludes 1, they are 5 and 31. The prime factors of 155 are 5…

### Why do you say the prime factorization instead a prime factorization?

Saying "The" Instead of "A" The prime factorization is used instead of a prime factorization because there is only one correct prime factorization of any given number. Of course, that refers to composite numbers because prime numbers have no prime factorization. The use of the word "a" implies that more than one prime factorization is possible when it's not. The use of the word "the" signifies that only one prime factorization is possible, though there…