What does it mean that every big even number is the sum of the products of a prime number and no more than two prime numbers?

This is Goldbach's conjecture 1+2 (the penultimate step of proof). Meaning: even number = prime number+prime number x prime number.

Similarly, 1+3 means even number = prime number+prime number x prime number x prime number,

2+3 means even number = prime number x prime number+prime number x prime number.

The final result of Goldbach conjecture is 1+ 1, which means even number = prime number+prime number.

A large even number refers to an even number greater than 4. Because even number two is special.