1 and 7 do.
That makes 7 a 'prime' number.
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175 Goes into 875 evenly!!!!!
5 goes into 365 evenly.
2 goes evenly into 4 and 28
5 goes into 155 evenly. 155/5 = 31
Seven and three are both prime numbers, therefore their only factors are one and itself. Nine's factors are 9,1, and 3. 3 Goes into 3 evenly, but doesnt go into 7 evenly. Therefore the only number that fits into 9, 7, and 3 evenly is 1. Hope this helps!