No problem, we've got 6458 and 1540 to multiply
6458 × 1540 = 1540 × (6458)
+ 1540 × 8 what gives us 12320
+ 1540 × 50 that is equal 77000
+ 1540 × 400 what gives us 616000
+ 1540 × 6000 resulting in 9240000

= 9945320
