Which number is neither prime nor composite:

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Both 1 and 2

answer is D.

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Detailed Solution

Concept: We must first have a thorough understanding of prime and composite numbers in order to answer the issue. A composite number is one that is divided by at least one number other than itself, as opposed to a prime number, which can only be divided by one and by the number itself.
For a better understanding, let's look at a few additional aspects regarding prime numbers and composite numbers.
Prime numbers are ones with just the number itself and factor 1 as its other components.
For instance, if we take the number 19 into consideration, we know that its only elements are 1 and 19, which means that 19 will be a prime number.
Composite numbers are ones with more than two components, including the number itself and one other factor. Therefore, if we take the number 9 as an example, we know that it has a total of three factors: 1, 3, and 9. The number 9 is a composite number, as a result.
Prime numbers and composite numbers are now concepts that we understand quite well.
Any integer multiplied by 0 produces the result 0, indicating that 0 has an unlimited number of components. Prime and composite numbers are positive, as stated by the definition as well. Null, or not both positive and negative, is what we mean by 0. In this way, 0 is not a prime or composite number.
There is only one factor in 1 and that is 1 itself. It cannot be either a prime or a composite number because it does not meet the criteria for both categories.
Since "0" and "1" are neither prime nor composite, we may readily state this on this basis.
Hence, option 4 is correct.

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