58
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29
2, 7, and 29. 2 x 7 x 29 = 406
Yes.
To divide 406 by 7, you can use long division. First, see how many times 7 goes into the leading part of 406. It goes 5 times (since 7 x 5 = 35), leaving a remainder of 1. Bring down the next digit (which is 6), making it 16. 7 goes into 16 two times (7 x 2 = 14), leaving a remainder of 2. Finally, bring down the last digit (which is 0), making it 20. 7 goes into 20 two times (7 x 2 = 14) again, leaving a remainder of 6. Thus, 406 divided by 7 equals 58 with a remainder of 2, or you can express it as 58.285714 when rounded to six decimal places.
Yes, 406 is a composite number. Its prime factorisation is 2 x 7 x 29.