No problem, we've got 2405 and 6641 to multiply
2405 × 6641 = 6641 × (2405)
+ 6641 × 5 what gives us 33205
+ 6641 × 00 what gives us 0
+ 6641 × 400 what gives us 2656400
+ 6641 × 2000 that equals 13282000

= 15971605
