642/7 = 91.714285 recurring (that is, 91.714285714285...)
642 divided by 7 is 91 5/7 ≈ 91.71
15.2857
26.75
No, 642 divided by 4 is 160.5
0.0078
0.0031
160.5
214
107
321
The number 642 is not a prime number as it can be divided by 2 aswell as itself and one.
107
80.25