No problem, we've got 6423 and 3979 to multiply
6423 × 3979 = 3979 × (6423)
+ 3979 × 3 resulting in 11937
+ 3979 × 20 that is equal 79580
+ 3979 × 400 that is equal 1591600
+ 3979 × 6000 which equals 23874000

= 25557117
