Adjusting URL column formula

Greetings,

In column D, I have a specific page number for websites.

I am trying to create a column E, which would have a clickable link for each page.

For example:   

D1- 4321  E1-  https://bobsmadeupsite.org/4321     

D2- 4345  E2-  https://bobsmadeupsite.org/4345      

D3- 4598  E3- https://bobsmadeupsite.org/4598

Is there a simple formula to alter column E to add and adjust column D's information?

Help would be appreciated.  Thanks.