Short answer is NO
The only hotel which is inside Disney security is Grand Californian.
If you have a dining reservation you can enter through the front door. The alternative way, if you just want to check out the lobby is to go through Downtown Disney. To enter Downtown Disney you will have to go through Disney security and bag check. The actual park entrances are at opposite ends of the esplanade and thats where you need park tickets.
Disneyland Hotel and Paradise Pier are not inside Disney security so anyone can walk in from the street.