Prime Number or Not?

Random Science or math Quiz

Can you name the prime numbers (p) and composite numbers (n)?

Featured Feb 16, 2015

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Number'P'rime or 'N'ot?
2001
63
171
989
87
117
2013
31
114
79
61
187
149
73
1337
17
43
2011
199
19
Number'P'rime or 'N'ot?
947
639
101
1000
21
703
83
53
103
123
107
7
15
1103
153
1001
201
71
111
751
Number'P'rime or 'N'ot?
41
69
105
13
55
59
29
67
77
27
49
11
2
5
141
99
89
42
1999
4
Number'P'rime or 'N'ot?
263
641
51
999
267
222
1747
1967
47
207
23
37
3
1551
225
253
97
137
151
321

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