The numbers which are not only divisible by themselves but also divisible by 1 are known as

Options

A. odd numbers
B. composite numbers
C. even numbers
D. integers

Answer

To solve the question, "The numbers which are not only divisible by themselves but also divisible by 1 are known as," we will analyze the options provided: odd numbers, even numbers, prime numbers, and whole numbers.

### Step-by-Step Solution:

1. **Understanding the Question**:
We need to identify a category of numbers that are divisible by themselves and also by 1.

2. **Analyzing Odd Numbers**:
- Odd numbers are defined as numbers that are not divisible by 2 (e.g., 1, 3, 5, 7, 9, ...).
- All odd numbers are divisible by themselves and by 1.
- However, not all odd numbers fit the criteria of the question since they can have other divisors (e.g., 9 is divisible by 1 and 3).

**Conclusion**: Odd numbers do not exclusively fit the criteria.

3. **Analyzing Even Numbers**:
- Even numbers are defined as numbers that are divisible by 2 (e.g., 2, 4, 6, 8, ...).
- Like odd numbers, even numbers are also divisible by themselves and by 1.
- However, similar to odd numbers, they can also have other divisors.

**Conclusion**: Even numbers do not exclusively fit the criteria either.

4. **Analyzing Whole Numbers**:
- Whole numbers include all non-negative integers starting from 0 (e.g., 0, 1, 2, 3, ...).
- Whole numbers are divisible by themselves and by 1.
- However, they also include numbers that can have other divisors.

**Conclusion**: Whole numbers do not exclusively fit the criteria.

5. **Analyzing Prime Numbers**:
- Prime numbers are defined as numbers greater than 1 that have no positive divisors other than 1 and themselves (e.g., 2, 3, 5, 7, 11, ...).
- By definition, prime numbers are only divisible by 1 and themselves.

**Conclusion**: Prime numbers fit the criteria perfectly.

6. **Final Answer**:
The numbers which are not only divisible by themselves but also divisible by 1 are known as **prime numbers**.