There is a function to list the prime divisors or prime factors.

It is called `prime_divisors`

, and aliased as `prime_factors`

.

The `len`

function can then give the number of prime factors.

```
sage: a = 234
sage: prime_divisors(a)
[2, 3, 13]
sage: len(prime_divisors(a))
3
sage: prime_factors(a)
[2, 3, 13]
sage: len(prime_factors(a))
3
```

The function `prime_divisors`

and its alias `prime_factors`

also exist as methods of integers.

```
sage: a.prime_divisors()
[2, 3, 13]
sage: len(a.prime_divisors())
3
sage: a.prime_factors()
[2, 3, 13]
sage: len(a.prime_factors())
3
```