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Literally every single even number less than 1000 is a composite number other than 2 which is prime.
99 is the largest composite number less than 100: its prime factorisation is 3 x 3 x 11
It is: 88
Neither. The concept of prime and composite applies only to positive whole numbers [greater than 1].
A prime number is a number that is divisible only by 1 and itself; it has no other factors. A composite number is a number that is divisible by more than two numbers - more than 1 and itself. The only factors of 211 are 1 and itself. Therefore, it is a prime number.