2, 3, 5 and 7
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The smallest number divisible by first four prime numbers is 2x3x5x7 = 210.
The smallest four prime numbers are 2, 3, 5, 7, and their sum happens to be a prime.
The sum of the five smallest prime numbers is 18.
The smallest composite numbers are 4, 6, 8, 9, and 10. It should be noted that the number 1 is a unit, and is neither prime nor composite. The numbers 2, 3, 5, and 7 are all prime, leaving the remaining numbers as the 5 smallest composites.
Multiply the 4 smallest prime numbers... 2 X 3 X 5 X 7 = 210