The factors of 105 are: 1, 3, 5, 7, 15, 21, 35, and 105
3, 5, and 7 are prime numbers. That's three.
Technically, ' 1 ' isn't defined as a Prime number,
although you'd certainly think it should be.
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210
17
The four smallest prime numbers are 2, 3, 5 and 7. Multiply them together. You'll get 210.
No, the number 1155 is divisible by four prime numbers (3, 5, 7, 11).
336