No problem, we've got 4407 and 603 to multiply
4407 × 603 = 603 × (4407)
+ 603 × 7 what gives us 4221
+ 603 × 00 resulting in 0
+ 603 × 400 resulting in 241200
+ 603 × 4000 what gives us 2412000

= 2657421
