Is "far more easier" grammatically correct?

形容詞如果得一或兩個音節（syllable）就加 -er / -est，如：
thin - thinner - thinnest
hungry - hungrier - hungriest
三個音節或以上就o係前面加 more / the most，如：
interesting - more interesting - the most interesting
咁 easy 得兩個音節，自然係變 easier 啦，-er 其實已經有 more o既意思，所以唔會再加 more；far more 都一樣，因為 far 只係強調程度。點解你見到咁講？因為人會講／寫錯野，亦可能係真係唔識而錯囉。
正確應該係 far easier。

no not grammatically correct

should be far much easier

not grammatically correct, but often used even by native speakers.

It is wrong.