No problem, we've got 2156 and 6255 to multiply
2156 × 6255 = 6255 × (2156)
+ 6255 × 6 which equals 37530
+ 6255 × 50 yielding 312750
+ 6255 × 100 what gives us 625500
+ 6255 × 2000 what gives us 12510000

= 13485780
