all of these are except 4. 4 is not a prime number!
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3 is a prime number. 4 and 10 are both composite numbers having 2 as a factor.
2, 3, 5 and 7
If the two prime numbers are different: You get the two prime numbers, plus 1, plus the product. For example, if you multiply 2 x 3 = 6, the factors of 6 are 2, 3, 1, and 6. If the two prime numbers are the same: You get the prime number, 1, and the product. For example 2 x 2 = 4. The factors of 4 are 2, 1, 4.
the prime numbers between 2 and 10 are 2, 3, 5, and 7.
The first four prime numbers are 2, 3, 5, 7. The product of these numbers is 2 x 3 x 5 x 7 = 210