Is this a set/list or a number?

Questions
,
1

Hi,

I am new to Mathematica and sorry if this is too simple.

list.png
list.png1057×759 7.55 KB

Out56 seems to say that we can add {1} to 1, so we have {2}.

Out57 says we can not compare {1} to 1.

I 'd like to know, elements in Out55, are they sets/list or numbers?
Is there a simple way to check the types of the outputs? (tells me whether they are Tables, Array, Functions, Procedures, Numbers)

Thanks!

2

Lists.

http://reference.wolfram.com/mathematica/ref/VectorQ.html

http://reference.wolfram.com/mathematica/ref/NumberQ.html

https://reference.wolfram.com/mathematica/ref/SameQ.html