No problem, we've got 6396 and 1340 to multiply
6396 × 1340 = 1340 × (6396)
+ 1340 × 6 what gives us 8040
+ 1340 × 90 that equals 120600
+ 1340 × 300 which equals 402000
+ 1340 × 6000 giving us 8040000

= 8570640
