Checking if a number is divisible by 2?

Question

I'm trying to write a program that checks if a number is divisible by 2. The input needs to be a number(Obviously xD). If the input is not a number, it needs to say something along the lines of "Input is not a number. Please enter a number!". If the input is a number, it needs to display 1 of 2 things:

1. "VariableNumber is not divisible by 2.

2. VariableNumber is divisible by 2.

Everything I try fail. In my last attempt, I was able to make it so it would display those 2 things, but entering letters caused it to print "(random letters) is not divisible by 2.". I manged to fix it, but then all of the sudden, everything was divisible by 2. So I need help. Here's the new code I just started. You can go about displaying the output any way you want.

https://code.sololearn.com/W71keXUbAKcL/#html

Answer 1

I know how to check for it, but how can I make it do all of the things mentioned? I just tried it again and it didn't work. It seems to ignore my code telling it to print something else if it's not a number. just says "letters is not divisible by 2".

Answer 2

Thanks 「ＨＡＰＰＹ ＴＯ ＨＥＬＰ」

Also, long time no see xD

Answer 3

One more question

Why did it not work with my version? My version was pretty much the same, except I used this:

if(a !== NaN) {
//code to execute
}

or

if(a !== isNaN) {
//code to execute
}

Answer 4

But even when I used isNaN in ny version, it failed. Why?

Does it have to do with the way I typed it?

Answer 5

if(!isNaN(a) {
// a is a number
}