SOLUTION: What is the smallest prime factor of 1821?

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Question 248153: What is the smallest prime factor of 1821?
Answer by Fombitz(32388) About Me  (Show Source):
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Since the digits sum to 12 (1+8+2+1=12) then 1821 is divisible by 3.
1821/3=607
607 is a prime number.
1821=3*607
3 is the smallest prime factor.