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It's called 'Passcode' and you can change it in settings.
Assuming it's a reasonably recent version of iPhone and iOS ... launch the Settings application (the gear in a gear) and scroll down until you see "Touch ID & Passcode" (or maybe Face ID & Passcode, I've got an older phone with just touch id).
There's an entry on that page to turn off passcode or to change it.
Suggest instead though that you train it for touch id (or face id) and keep your phone locked. It's surprising how much damage can be done if it's stolen and not protected! 
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