Code Help Please ->["IF VARIABLE1 begins with "XYZ"]?

Hello, all.

I’m having trouble creating a conditional statement. I want to direct users to different Scenes / frames based on the first three numbers of their 7-digit assigned account nos.

I cant seem to figure out how to write the condition:
"IF VARIABLE1 begins with “555” gotoandStop…

Any help would be appreciated.

Thank you.