They are: 3*3 = 9 and 3*7 = 21
It is: 3*3 = 9
No, it is composite. 21 is divisible by 1, 3, 7, and 21. =)
It is: 2*7 = 14
3 x 19 = 57
9
9 PM
45
9 is the product of 3 * 3, or 3 squared.
Prim and Proper,
As a product of its prime factors: 2*32*5*7 = 630
real, true, meet
The word pair for prim is proper PRIM AND PROPER