Alright, let's work through 5386 times 3604 step by step
5386 × 3604 = 3604 × (5386)
+ 3604 × 6 that equals 21624
+ 3604 × 80 that equals 288320
+ 3604 × 300 yielding 1081200
+ 3604 × 5000 giving us 18020000

= 19411144
