This is the 7564th most frequent Russian word.
достоевских
"Достоевских" refers to something related to Dostoevsky, often meaning "of Dostoevsky" or his works, ideas, or style.
Here, 'Достоевских' refers to the famous author Fyodor Dostoevsky, modified to show possession or association of his works.
Многие произведения Достоевских принадлежат мировой классике.
Many works of Dostoevskys belong to world classics.
The word 'Достоевских' is again used to denote attribution to the literary works or philosophy of Dostoevsky.
У нас на вечеринке обсуждали идеи Достоевских.
At our party, we discussed the ideas of Dostoevskys.
Here, 'Достоевских' is used to refer to the books authored by Dostoevsky.