9
102
21 is a composite number because it has at least one positive factor other than one or itself.
No, 16 is not a square of a composite number. It is a square of a prime number, which is 4.
16
23?
102
24
16
21 is a composite number because it has at least one positive factor other than one or itself.
144, 324, 576, 900
The answer depends on the number of tiles.
64
Take your pick: It could be 33: the only composite number with repeated digits It could be 71: the only prime number It could be 4: the only square number It could be 106: the only composite number with all different digits.
144
No, 16 is not a square of a composite number. It is a square of a prime number, which is 4.
16
327 is composite but not a square.