The number 125 is a composite number. It can be expressed as:

$125 = 5 \times 5 \times 5 = 5^3$

Thus, one prime divisor of 125 is 5.

Would you like further details or have any questions?

Here are 5 related questions to explore further:

1. What are all the factors of 125?
2. How do you check if a number is prime?
3. What is the prime factorization of a number?
4. Can a number have more than one prime divisor?
5. How do you find the greatest common divisor (GCD) of two numbers?

Tip: When finding prime factors, always start by checking small prime numbers like 2, 3, 5, etc.