Method 1: Clearing Cache

Most Common Reason you might be facing this Error  is because of Cache, so i will start the Methods list by Recommending you to Clearing the Cache.

To do So, Just navigate to Settings > Applications > Manage Applications > Select Google Play store > Clear Data & Clear Cache.

Now Try and download the App if Cache was the problem and clearing it solved the Issue for you.  One more reason of listing this method on top is this worked for me and i was able to download the game easily after clearing the Cache. Though the Solution for all might not be the same so try below methods too.

Method 2: Use Wifi to Download.

Many a times your Internet Service Provider(ISP) Creates this Problem of Error 498 and many other Errors. so Try and get access to Wifi somehow and try to download the app thats giving you the Error.

Method 3: Adding New Play Store account.

You will need to Add a new Play store account inorder to fix this Error. Go to Settings > Accounts > Add New Account > Click on Google > Next > Enter email > Done.

After setting up new Play store account try to download the same app and see if this have Solved your Problem.

Method 4: Connecting with Computer:

One of my Friend reported that he fixed Error 498 by installing apps from Computer to Smartphone. You just need to connect your Smartphone to Computer Using USB Cable. then goto Google Play Store using your Favourite Browser on your Computer. Then Search for the App which was getting error on your Smartphone.

Click on the Preferred Result that you get, next On the App page you will see Install button. Click it to Download that app On your Smartphone. No it will not Install on your Computer. it will Install on your Smartphone. Just make sure your Smartphone is Connected or else you will not See Install Button.