S.O.S.! Problems with if/else conditions!

My code:

var counter = 0;

var firstQuestion = prompt ('Which is a currency unit in Germany?');

if (firstQuestion.toUpperCase === 'EURO')

{ counter += 1; }

else {

alert ('Answer is not correct');

counter = 0; }

var secondQuestion = prompt ('In which year first 13 colonies was signatured The Independence Declaration');

if (secondQuestion.parseInt === 1776)

{ counter += 1; }

else {

counter;

alert ('Answer is not correct'); }

Have 2 variables - firstQuestion and secondQuestions. No matter what I enter in my prompt window, always opens alert message, talking that "Answer is not correct", even if an answer is correct.