Alright, let's work through 2544 times 7645 step by step
2544 × 7645 = 7645 × (2544)
+ 7645 × 4 that equals 30580
+ 7645 × 40 yielding 305800
+ 7645 × 500 which equals 3822500
+ 7645 × 2000 resulting in 15290000

= 19448880
