Alright, let's work through 2401 times 1645 step by step
2401 × 1645 = 1645 × (2401)
+ 1645 × 1 resulting in 1645
+ 1645 × 00 giving us 0
+ 1645 × 400 that equals 658000
+ 1645 × 2000 which equals 3290000

= 3949645
