# A mysterious square

I am a square, the youngest I can be, but not a baby.
but not the multiplied by one.
I'm not a mishearing of no.
My friends call me strange.
But, I am not only one.
What am I?

Complete explanation of main riddle for acceptance.

I guess that you are:

-1

I am a square, the youngest I can be, but not a baby.

-1 = i ^ 2, where i is the unit imaginary number.

The 'not a baby' rules out zero, based on the4kman's answer and user_194421's subsequent update to the question.

but not the multiplied by one.

This rules out 1 (or +1) as being the square

I'm not a mishearing of no.

This rules out 0 ("oh") and 4.

When my friends asked me, "What is your area?", I said I have none.

Positive squares can be considered as the representation of an area, whereas -1 cannot.

They called me strange as a result.

This does not fit in with conventional (physical) examples of numbers, hence is strange (and the associated numbers are therefore called complex numbers).

But, I am not only one.

Because you are minus one.

What am I?

Are you

0?

I am a square, the youngest I can be

Zero is the smallest non-negative number, and the square of 0.

but not the multiplied by one

Zero is not the square of 1.

I'm not a mishearing of no

You are not "four".

When my friends asked me, "What is your area?", I said I have none

A square with sides of 0 has an area of 0.

They called me strange as a result

If you get 0 as a result, it's unusual (you might've been miscalculated something, e.g. multiplied something with 0).

But, I am not only one

You are not one (since you are 0).

• How is "four" a "mishearing of no"? The fact that your answer isn't 4 is irrelevant. What about "Oh"? – John Coleman Jan 19 '18 at 16:04
• nine sounds like nein – Jasen Jan 21 '18 at 11:09