No problem, we've got 6391 and 8602 to multiply
6391 × 8602 = 8602 × (6391)
+ 8602 × 1 that results in 8602
+ 8602 × 90 that is equal 774180
+ 8602 × 300 resulting in 2580600
+ 8602 × 6000 yielding 51612000

= 54975382
