Let's calculate 1997 x 1837
1997 × 1837 = 1837 × (1997)
+ 1837 × 7 that results in 12859
+ 1837 × 90 that results in 165330
+ 1837 × 900 what gives us 1653300
+ 1837 × 1000 that results in 1837000

= 3668489
