Now I am not so sure, but the first player makes the move first (selects the number), then the second player makes their move without seeing the results of the first player's move. Meaning after the first move there is information hidden from the second player.

It's imperfect information because both players don't know the same information.

Perfect information = Chess Imperfect information = Poker

This fits into the latter category - if player 2 knew everything that player 1 knows, they would behave differently.