no. there's 2
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2 x 7 x 7 x 17 = 1666
Use factor trees. 828 414,2 207,2,2 69,3,2,2 23,3,3,2,2 1666 833,2 119,7,2 17,7,7,2
No and it includes every symbol of the Roman numeral system in order because MDCLXVI equals 1666
1666 = mdclxvi
7 is a prime number!