To Be or Not to Be A PRIME

1
To Be or Not to Be A PRIME
Which of these numbers are prime?
2
Look at me. Im 12.I can make these rectangles
12
1
Another way of saying it. My Factors
are 1x12 2x6 3x4 Im not Prime.
2
6
3
4
3
Look at me. Im 9.I can make these rectangles
Another way of saying it. My Factors
are 1x9 3x3 Im not Prime.
4
Look at me. Im 7.I can only make this rectangle
Another way of saying it. My Factors
are 1x7 Im Prime.
So what makes me a Prime Number?
5
Now You Try 10 and 11
Whose Prime and Whose Not
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To Be or Not to Be A PRIME
1
18
2
17
3
16
4
15
Which of these numbers are prime?
5
14
6
13
7
12
8
11
9
10
7
Is there a pattern to PRIMES?

• Goldbachs famous conjecture was that all even
  numbers can be written as the sum of two primes.
  Check it out. (e.g. 12 75)
• Its a CONjecture because it looks like it works
  but nobody is a 100 sure.
• The I Hate Mathematics Book by Marilyn Burns
  contains loads of puzzles and stuff like this.
• Uncle Petros and Goldbachs Conjecture is a
  really good, lighthearted novel about one mans
  obsession.