The heavens declare the glory of God (Ps 19:1). How many stars are in God's created universe? We do not know, but the Creator does. There is a number of stars, not one more, not one less.
But the Creator "cannot be numbered." The mighty things He has done, His decisions, His wealth are unsearchable, past finding out, without number, inscrutable, untraceable (Job 5:9, Ps 145:3, Rom 11:33, Eph 3:8).
What is man that the unsearchable God is mindful of him (Ps 8:4)? Dust, into which God breathed and made a living soul (Gen 2:7, Gen 3:19).