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Yes 19 is prime. Prime is when the number only has two factors. One and itself. A compostie number is a number that has more than two factors. The only number that is not prime or composite is 1. One is a special number. It is the only number that isn't prime or composite.
In all but one case. Literally, The number "one" is neither prime nor composite.
0 is neither a prime or a composite number. It can not be divided by any number, so it would be difficult to classify it as prime or composite. 0 and 1 are the only numbers that are not prime and are not composite.
37 is a prime number only 1 multiplied by 37 will get you 37.
A prime number is a natural number greater than one that can only be divided evenly by itself and 1. A composite number is the opposite of a prime number. By definition, every natural number greater than one is either prime or composite.