‘Digit grouping’ and ‘clustering’ are just terms for the same thing (depending on which version of my calculator I happened to use) eg; take 2,701 then digit group/clusterize it and it becomes 703 or 2 + 701. It is just splitting numbers up into their constituent 3 digit sections which is one of the the foundations of ‘our’ numbering system.
Factors are simply the numbers that when multiplied together make another number eg 37 * 73 =2701. The factors of 2701 are 37 and 73.
A prime number is a number which has no factors other than itself eg; 2, 3, 5, 7, 11, 13, 17 etc are all primes. Essentially indivisible.
A prime factor is a factor which is also a prime eg; 37 and 73 are the prime (and only) factors of 2,701 (which is the total gematria for Gen 1:1).
The hebrew is the Tanach – you can check the data yourself as copies of the Tanach are easily found on the internet. The gematria number assignment to hebrew letters is just the most commonly used gematria system. It has a name but I can’t remember it just now.
Gematria is nothing new but being able to analyse on this scale is newish. It takes only a few seconds for the calculator to process a whole chapter of scripture. It is not database based but you plug the actual hebrew in and it calculates on the fly. For the present it is not publicly available.
The calculator also processes NT greek but the hebrew is far more rewarding as it less prone to error. Indeed, every jot and tittle appears to be in place for large sections of the O.T. The Book of Daniel is no exception and in my mind is a proof of it’s divine authorship (as Christ attested to himself referring to Daniel the ‘Prophet’).