I was in a dispute between 6 participants, blinds at 50/100, I (1550 chips) had The Qs As on the Button and I was the first to act, with 400 chips. The Small Blind folds, but the Big Blind pushes all-in with 1400 chips. (1000 to pay in a pot of 1850) (1400 + 400 + 50). call or fold?

With 15 BBs, are you really considering opening with 25% of your stack just to fold to a 3bet shove? If you're considering folding to a 3bet, open smaller.

As played, this is an easy call unless villain is an absolute nit that is jamming AK, QQ+ only. Or unless this is a final table and there are smaller stacks, but then you could open smaller pre in that situation. If it's not a final table or anywhere close to it, this is an easy open jam if villains are calling light or you can open with the intention of calling a 3bet jam pre.