Alright, let's work through 3707 times 3599 step by step
3707 × 3599 = 3599 × (3707)
+ 3599 × 7 yielding 25193
+ 3599 × 00 resulting in 0
+ 3599 × 700 what gives us 2519300
+ 3599 × 3000 yielding 10797000

= 13341493
