A positive integer with only two factors.
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1 is not considered a prime number; 1 is a perfect square.
1 was considered as a prime but now the definition changed. Now the definition was that a prime is divisible only by 1 and itself
A composite number is made up of a product of prime numbers. It might be considered a non-prime number.
1 is not considered to be a prime or composite number because it has only one factor which is itself.
The number one is not prime because it can only be divided by one number (not too) as itself and 1 are the same number