A rational number like 25 is simply called a rational number. Rational numbers are numbers that can be expressed as a fraction of two integers, where the numerator is an integer and the denominator is a non-zero integer. Since 25 can be written as $\frac{25}{1}$, it qualifies as a rational number.

Would you like more details on rational numbers, or do you have any questions? Here are some related questions that might interest you:

1. What distinguishes a rational number from an irrational number?
2. How do you identify whether a number is rational or irrational?
3. Can all integers be considered rational numbers?
4. What are some examples of irrational numbers?
5. How do you convert a repeating decimal into a rational number?

Tip: Remember, all integers are rational numbers because they can be written as a fraction with a denominator of 1.