Alright, let's work through 7983 times 1555 step by step
7983 × 1555 = 1555 × (7983)
+ 1555 × 3 that is equal 4665
+ 1555 × 80 giving us 124400
+ 1555 × 900 giving us 1399500
+ 1555 × 7000 that is equal 10885000

= 12413565
