Alright, let's work through 6637 times 1898 step by step
6637 × 1898 = 1898 × (6637)
+ 1898 × 7 that is equal 13286
+ 1898 × 30 yielding 56940
+ 1898 × 600 giving us 1138800
+ 1898 × 6000 giving us 11388000

= 12597026
