# Is 155 a prime or composite number or neither?

155 is a composite number. Its factors are 1, 5, 31, and 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…

### Is 155 an even number or a composite number?

An even number is one which is divisible by 2. 155 is not divisible by 2, so it is not an even number. A composite number is one which has more than two factors. Factors of 155 are 1, 5, 31 and 155, it has more than two factors. So, 155 is composite. When we ask what type of a number is, then we have to choose the categories which have some relation. Let us…