No problem, we've got 6557 and 6420 to multiply
6557 × 6420 = 6420 × (6557)
+ 6420 × 7 that is equal 44940
+ 6420 × 50 yielding 321000
+ 6420 × 500 yielding 3210000
+ 6420 × 6000 giving us 38520000

= 42095940
