Yes, Beagles can be worse than other dogs on the... stubborn side.
I watched this boy for a while...and he was one of the most stubborn, toughest-to-train dogs I'd ever worked with! You need to start working with your puppy now, start training from the beginning. Socialize him with other dogs, take him out so he's familiar with people of all types. And definetly start training now, especially the command "heel". Give him boundaries, and take him outside off leash as a pup, be sure he knows he is not allowed to leave the boundaries selected by you (the yard, the neighborhood, the driveway, etc. (whatever you choose)). He needs to know this from the beginning. Whenever he leaves the boundaries, push him back and say "In the yard". He needs to know that unless he's on the leash, he needs to stay inside the boundaries.
They have one hell of a bark. Be sure he knows better than to bark continously when someone comes to the door, or any other time you are not okay with him barking.
Beagles need lots of exercise. He needs to run. Having him pull you on your rollerblades with a harness on (a collar will choke him when he's doing this activity) is a great way to relieve his energy.
Also, Beagles like to have a job. Once my neighbor's dog got loose in the neighborhood. Charlie understood the ruckus, and chased him down until the dog was tired out, and then rounded him back up to us! It was amazing, I was so proud of him! If you can find a dog pack that dogs carry on their packs the right size for Beagles, that is great. If you have a harness, let him pull you on your rollerblades. This is something Charlie absolutly LOVED and he got tried very, very quickly from it.
Charlie, the Beagle I watched for a while.
The owners ended up rehoming Charlie because they weren't aware of the persistance he needed. He was a sweetheart, but they soon noticed how stubborn he was and how much he needed to be worked with. Don't let this happen to your Beagle! Start working with him from the beginning, and realize the characteristics, etc. of the Beagle breed. Be sure this is the right breed for you.
Without boundaries and training from the beginning, you'll end up with a dog that will run off, pull on the leash, etc.
Remember, you are the boss! He should do what you want him to do, you shouldn't be doing what he wants you to do.
I hope you're ready for this! Beagles are a real challange and need strict training and boundaries 0_o
Good luck!