No prime numbers are divisible by 3. By definition a prime number isn't divisible by anything but itself and 1.
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Three.
None, if a number is divisible by 210 then it is not a prime number!
By four prime numbers which are: 2 3 5 and 7
All prime numbers are divisible only by one and themselves.
Because many of them are divisible by smaller odd numbers. For example 35 is divisible by 5 and so 35 cannot be a prime number.