This is the 7328th most frequent Russian word.
газпромбанк
Gazprombank: A major Russian bank affiliated with the energy company Gazprom.
Here, 'Газпромбанк' is used as a subject referring to the name of the institution.
Газпромбанк является крупным финансовым учреждением в России.
Gazprombank is a major financial institution in Russia.
In this sentence, 'Газпромбанк' is used in the prepositional case referring to the location for opening an account.
Я планирую открыть счёт в Газпромбанке, так как он предлагает удобные условия.
I plan to open an account at Gazprombank because it offers convenient terms.
Here, 'Газпромбанк' is again in the prepositional case indicating the place of employment.