The German becomes the fourth quadruple champion and only the third driver to land four titles in a row after Germany's seven-times winner Michael Schumacher and the late Argentine Juan Manuel Fangio.
Force India boss Vijay Mallya says his partnership with the Formula 1 team's co-owner Subrata Roy stands strong despite the Sahara Group chief being in jail since March 2014.
Paul di Resta suffered his third retirement in a row and Adrian Sutil sneaked into the top-10 in the last lap as Sahara Force India added one point to their tally from the exciting Singapore Grand Prix, where fortunes swung like a pendulum for the Indian F1 team.
Luca di Montezemolo's resignation as Ferrari chairman on Wednesday severs an historic link with the company's late founder Enzo and marks the end of an era for Formula One's most successful and glamorous team.
Formula One should revert to last year's tyres for safety reasons to prevent any repeat of Sunday's dangerous British Grand Prix blowouts, according to Red Bull principal Christian Horner.
Kimi Raikkonen has plenty of supporters among the passionate Ferrari 'tifosi' as the team's first champion of the post-Schumacher era, and last to date, and his return would a break with Ferrari tradition as much as a blast from the past.