Alright, let's work through 2151 times 2644 step by step
2151 × 2644 = 2644 × (2151)
+ 2644 × 1 that equals 2644
+ 2644 × 50 yielding 132200
+ 2644 × 100 producing 264400
+ 2644 × 2000 producing 5288000

= 5687244
