The answer is No.
When you register with Exness through the web, you will automatically be given a demo MT5 account with USD 10,000 virtual funds which you can use to practice your hand at trading. Furthermore, you can create additional demo accounts which have a preset balance of USD 500 which can be changed during account creation and even afterwards.
Registering your account on the Exness Trader app will also give you a demo account with a balance of USD 10,000 ready to use. You can add or deduct this balance using the Deposit or Withdrawal buttons respectively.