Two ways to do this:
1. Enter it as a text field (start with a single quote: ')
2. Give this cell (column) a custom numeric format including the zeroes. That's something like 00000000000 if you want to show 10 digits.
Both ways, by the way, should be covered in any basic course about Excel. Assuming it's for your work, why not ask your boss to pay for such a course? It should enhance your productivity with this useful tool.
If you're a student, see if the school offers some course about using Excel that you can follow.
When typing numbers into a cell, how do I get zeros to show up when they come BEFORE the first number example: 00059432183? Trying to add student numbers to excel but only 59432183 shows up as it eliminated the first zeros.