1 and 167 (167 is a Prime number).
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No even number gose in 21. In fact there is none that goes in 21, either.
One.
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ANSWER: YES. 167 is a prime number.167 is a prime number because the only factors of 167 are 1 and itself (167).
First of all to correct your English Grammar. 'What gose ...' should read, 'What goes...'