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It is impossible to list all the prime numbers: it has been proven (2000 years ago) that there are infinitely many. In other words, there is no last prime number.
There are no two "last" composite numbers. Just as with prime numbers, and all numbers, they go on for ever and ever and ever and ever ... ... .
There cannot be the last two prime numbers because there are an infinite number of them.
It stands for "first, outsides, insides, last". It is how to multiply out double brackets such as (x+3)(x-4). First numbers, inside numbers, outside numbers, last numbers.