No problem, we've got 1641 and 6939 to multiply
1641 × 6939 = 6939 × (1641)
+ 6939 × 1 resulting in 6939
+ 6939 × 40 what gives us 277560
+ 6939 × 600 yielding 4163400
+ 6939 × 1000 what gives us 6939000

= 11386899
