Alright, let's work through 3631 times 9644 step by step
3631 × 9644 = 9644 × (3631)
+ 9644 × 1 resulting in 9644
+ 9644 × 30 what gives us 289320
+ 9644 × 600 that is equal 5786400
+ 9644 × 3000 yielding 28932000

= 35017364
