The prime factorization is 2 2 2 3 3 3 3. So if you multiply those numbers, you will get 648. One example is 2*324.
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How about: 8*81 = 648 or 2*324 = 648 out of many possibilities
(324,2)(216,3)(162,4)(108,6)(81,8)(72,9)(54,12)(36,18)(27,24)
648, 1,296, 1,944, 2,592, 3,240, 3,888, and since 648 is infinite because all numbers keep going and never stop.
No number less than 648, including those between 2 and 11, is divisible by 648. But 648 is divisible by 2, 3, 4, 6, 8, and 9.
When you multiply numbers, you get their product.