No problem, we've got 6341 and 6640 to multiply
6341 × 6640 = 6640 × (6341)
+ 6640 × 1 yielding 6640
+ 6640 × 40 giving us 265600
+ 6640 × 300 what gives us 1992000
+ 6640 × 6000 yielding 39840000

= 42104240
