Alright, let's work through 2545 times 1636 step by step
2545 × 1636 = 1636 × (2545)
+ 1636 × 5 which equals 8180
+ 1636 × 40 giving us 65440
+ 1636 × 500 what gives us 818000
+ 1636 × 2000 producing 3272000

= 4163620
