2 FAQs:

Q: Is a 2 easily tested by merely looking at the last digit?

A: Yes.

Q: Is a 2 identified with the set {{∅},∅}?

A: Yes, This latter set is important in category theory: it is a subobject classifier in the category of sets.

Q: Is a 2 the first Sophie Germain prime?

A: Yes, and the first factorial prime, the first Lucas prime, the first Ramanujan prime, and the first Smarandache–Wellin prime.

Q: Was a 2 the first known irrational number?

A: Yes.

Q: Is a 2 the position of the catcher?

A: Yes.

Q: Is a 2 important in Judaism, with one of the earliest references being that God ordered Noah to put two of every unclean animal in his ark?

A: Yes, Later on, the Ten Commandments were given in the form of two tablets.