Alright, let's work through 3504 times 998 step by step
3504 × 998 = 998 × (3504)
+ 998 × 4 that equals 3992
+ 998 × 00 that results in 0
+ 998 × 500 yielding 499000
+ 998 × 3000 that equals 2994000

= 3496992
