There are two interpretations of what you are asking in the way you have written your question:
1. what is 923458 divided by 1000: 923458 ÷ 1000 = 923.458
2. What digit is in the thousands place value column: this column is the 4th to the left of the decimal point which is hiding at the right hand end; thus the thousands digit is the 3.
Thousands and thousands and thousands............
To many to count! Thousands upon thousands.
120,000 thousands
600.572 thousands.
3.785 thousands.
1,049.753 thousands.
700,000 thousands.
1,000
2,000,000 thousands.
Thousands and thousands
5 thousands
4,280 thousands.