Hello Lellsworth3,
Thanks for participating in the Apple Support Communities.
It sounds like you were unexpectedly asked to enter your Apple ID (iTunes Store account) password when using apps on your iPhone.
In a situation like this it's a good idea to change your Apple ID password, as mentioned in Security and your Apple ID:
If you believe your account information has been compromised, visit My Apple ID to change your password immediately. If you need additional help, contact Apple Support.
You can find some additional tips at that link for securing your account, such as adding security questions to your account or enabling two-step verification.
All the best,
Jeremy