That was a made up number, take a prime number . e.g. 359334085968622622831041941960188598043661065388726959079837 This one. The experimental laser-based miner is already solving blocks faster than anyone else. Sounds like science fiction, but it will be proven when you see in blockchain a huge number of solved blocks by one miner. There is no other way to prove it.

No, not looking for a number that gives an exact answer, but For example, what two numbers should be multiplied by each other to get, say, 7. Any options?

2,63*2,63