25 of them
Just two: 2 and 5.
Square numbers can't be prime. They have too many factors.
None because square numbers have more than two factors
25 of them.
46 of them.
25 of them.
25 of them.
25 of them.
25
Twenty five.
Square numbers have too many factors to be prime.
3 numbers 2, 23 and 29