I don't know if you understand English or not. I'm afraid I don't speak Russian.
The translation of your question is "what is a module number"?
What I think you're asking is what does (mod N) mean.
If I have some number X mod N this refers to the remainder resulting from X/N
for example if N=10
12 mod 10 = 2
because 12 = 2*10 + 2
similarly
2343243256243262343243 mod 10 is 3
so if K = X mod N
X = m*N + K where m is a (usually positive) integer
+6251 
