Alright, let's work through 6421 times 4079 step by step
6421 × 4079 = 4079 × (6421)
+ 4079 × 1 that equals 4079
+ 4079 × 20 giving us 81580
+ 4079 × 400 yielding 1631600
+ 4079 × 6000 resulting in 24474000

= 26191259
