No problem, we've got 2538 and 1605 to multiply
2538 × 1605 = 1605 × (2538)
+ 1605 × 8 what gives us 12840
+ 1605 × 30 that is equal 48150
+ 1605 × 500 that results in 802500
+ 1605 × 2000 resulting in 3210000

= 4073490
