Alright, let's work through 3691 times 693 step by step
3691 × 693 = 693 × (3691)
+ 693 × 1 giving us 693
+ 693 × 90 which equals 62370
+ 693 × 600 that equals 415800
+ 693 × 3000 giving us 2079000

= 2557863
