56 = 2*2*2*7
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7 x 7
This is the prime numbers: O = 1 T = 3 F = 5 S = 7 E = 11 T = 13 S = 17 One has been included although not being prime. Two has been left out although prime. The next prime number after 17 is 19, and so the next letter would be N.
0.125
It is a composite number.
Zero point five six