No problem, we've got 6344 and 2155 to multiply
6344 × 2155 = 2155 × (6344)
+ 2155 × 4 resulting in 8620
+ 2155 × 40 that is equal 86200
+ 2155 × 300 which equals 646500
+ 2155 × 6000 resulting in 12930000

= 13671320
