However, the real reason that 1 is no longer considered prime is because it's useful to think of prime numbers as the building blocks of all numbers (like atoms) and every number can be made by a unique combination of prime numbers. This is the Fundamental Theorem of Arithmetic. But if you allow 1 to be a prime number, to any combination of primes can be added any number of "x1"'s, which means there isn't a single way of making any number, but an infinity of them. Which is not useful. So 1 was removed from the list of primes. It allows the Fundamental Theorem to be a theorem, and not a theorem as long as you exclude 1. 1 is excluded by definition.
Maybe not the best of questions.
The Lizard, on the other hand, is often referred to as the Lizard Peninsula. A bleak and beautiful place.
Thanks, these General Knowledge quizzes are very enjoyable.