# Is 878 a prime number?

It is possible to find out using mathematical methods whether a given integer is a prime number or not.

For 878, the answer is: No, 878 is not a prime number.

The list of all positive divisors (i.e., the list of all integers that divide 878) is as follows: 1, 2, 439, 878.

For 878 to be a prime number, it would have been required that 878 has only two divisors, i.e., itself and 1.

Find out more:

As a consequence:

For 878 to be a prime number, it would have been required that 878 has only two divisors, i.e., itself and 1.

However, 878 is a **semiprime** (also called biprime or 2-almost-prime), because it is the product of a two non-necessarily distinct prime numbers. Indeed, 878 = 2 x 439, where 2 and 439 are both prime numbers.

### Is 878 a deficient number?

Yes, 878 is a deficient number, that is to say 878 is a natural number that is strictly larger than the sum of its proper divisors, i.e., the divisors of 878 without 878 itself (that is 1 + 2 + 439 = 442).