9
The problem is "189/x = 21", so you can switch 'x' and '21' to get 189/21 = x or 9.
189 divided by 9 is 21.
It is 189/3 = 63
0.9841
45
25.2
0.1429
47.25
189
189
189
21
No, they can be divided. For example, 3 is a prime number because its only factors are 1 and 3. 80 is a prime number because it can be divided by 1, 2, 4, 8, 10, etc. 189 can be divided by 1, 3, 63, etc.