No problem, we've got 1398 and 6001 to multiply
1398 × 6001 = 6001 × (1398)
+ 6001 × 8 what gives us 48008
+ 6001 × 90 that results in 540090
+ 6001 × 300 which equals 1800300
+ 6001 × 1000 what gives us 6001000

= 8389398
