No problem, we've got 3407 and 6445 to multiply
3407 × 6445 = 6445 × (3407)
+ 6445 × 7 yielding 45115
+ 6445 × 00 that results in 0
+ 6445 × 400 that equals 2578000
+ 6445 × 3000 which equals 19335000

= 21958115
