Q: Why is 1 considered as a special number?

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I will assume you mean "positive integers". In this case, the only number that is considered neither prime nor composite is the number 1. 1 has the special role of the identity element of multiplication, meaning that if you multiply a number by 1, it remains unchanged.

it is the first number

Multiplicative identity. Because for any number a, 1*a = a

1 is not considered a prime number; 1 is a perfect square.

the number 1 is a special number. The number 1 is a confusing number to deal with, but it is called a special number.Example: Is 1 prime or composite? It is neither.

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Well, yes, the number 1 is usually considered in a special category. It is not considered prime, but it isn't composite, either.

I will assume you mean "positive integers". In this case, the only number that is considered neither prime nor composite is the number 1. 1 has the special role of the identity element of multiplication, meaning that if you multiply a number by 1, it remains unchanged.

1

it is the first number

Multiplicative identity. Because for any number a, 1*a = a

The number 1 is considered a single number.

1 is not considered a prime number; 1 is a perfect square.

A composite number is a number that has smaller factors (excluding 1). A prime number is one that doesn't (1 is not considered prime nor composite, because of its special role in multiplication).Since 15 is divisible by 3, it is composite.

the number 1 is a special number. The number 1 is a confusing number to deal with, but it is called a special number.Example: Is 1 prime or composite? It is neither.

1 is the first positive number on the number line.

Square numbers have an odd number of factors, all others have an even number. In this context, primes can either be considered as having 0 factors (an even number) or 2 factors - 1 and itself, again, an even number.

Three is considered a holy or magical number in many traditions. In math, three is also a special number.