Although angels have greater knowledge than men, they are not omniscient, as Matthew 24:36 points out.

Are there angels all around us?

Mannella says angels are all around us, despite claims from skeptics who discount them because they can't be seen or scientifically proven. We only need to be attentive to their presence to know they are there. ... In fact, many faithful believe angels are sent from God to help those in need.

How many angels do we know?

The idea of seven archangels is most explicitly stated in the deuterocanonical Book of Tobit when Raphael reveals himself, declaring: "I am Raphael, one of the seven angels who stand in the glorious presence of the Lord, ready to serve him." (Tobit 12:15) The other two angels mentioned by name in the Bible are ...