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Q: What is the prime number of 642?

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The number 642 is not a prime number as it can be divided by 2 aswell as itself and one.

They are: 2, 3 and 107

No, the first give-away is that it is an even number (divisible by 2).

1, 2, 3, 6, 107, 214, 321, 642 2, 3 and 107 are prime.

642 is composite. It is divisible by 2, 3, 107, 214, and 321.

2, 3 and 107

Just by looking at it, without trying any factors to see if they work, you can see-- 642 is even, i.e. divisible by 2, since it ends in '2'-- 642 is divisible by 3, since its digits add up to (6+4+2) = 12 which is divisible by 3.Just looking at 642, you already know of at least 2 factors that it has besides '1' and itself,so it can't be a prime number.

1, 2, 3, 6, 107, 214, 321, 642

In today's notation 642 = DCXLII in Roman numerals

Nope, a 742 centerfire but no 642.

No.

1 x 642, 2 x 321, 3 x 214, 6 x 107.

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