A prime number is

Options

A. an even number
B. an odd number
C. a composite number
D. None of these

Explanation

To determine what a prime number is, we can follow these steps:

1. **Definition of a Prime Number**: A prime number is defined as a natural number greater than 1 that has no positive divisors other than 1 and itself.

2. **Analyzing the Options**:
- **Option A: Even Number**: The only even prime number is 2. All other even numbers can be divided by 2, making them composite. Therefore, this option is not entirely correct.
- **Option B: Odd Number**: While most prime numbers are odd (like 3, 5, 7, 11, etc.), the number 2 is an exception as it is even. Thus, this option is also not entirely correct.
- **Option C: Composite Number**: A composite number has more than two positive divisors. Since prime numbers only have two divisors (1 and itself), they cannot be composite. Therefore, this option is incorrect.
- **Option D: None of These**: Since none of the previous options correctly define a prime number, this option is the correct answer.

3. **Conclusion**: The answer to the question "A prime number is" is **None of these** (Option D).