# Is 178 a prime number?

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

For 178, the answer is: No, 178 is not a prime number.

The list of all positive divisors (i.e., the list of all integers that divide 178) is as follows: 1, 2, 89, 178.

For 178 to be a prime number, it would have been required that 178 has only two divisors, i.e., itself and 1.

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As a consequence:

For 178 to be a prime number, it would have been required that 178 has only two divisors, i.e., itself and 1.

However, 178 is a **semiprime** (also called biprime or 2-almost-prime), because it is the product of a two non-necessarily distinct prime numbers. Indeed, 178 = 2 x 89, where 2 and 89 are both prime numbers.

### Is 178 a deficient number?

Yes, 178 is a deficient number, that is to say 178 is a natural number that is strictly larger than the sum of its proper divisors, i.e., the divisors of 178 without 178 itself (that is 1 + 2 + 89 = 92).