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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.
Wiki User
∙ 14y ago
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Is 642 a prime or composite number?
The number 642 is not a prime number as it can be divided by 2 aswell as itself and one.
What is the prime number of 642?
The prime factorization of 642 is 2 x 3 x 107.
What are the prime factors for number 642?
They are: 2, 3 and 107
Is 642 prime?
No, the first give-away is that it is an even number (divisible by 2).
Is 642 prime or composite?
642 is composite. It is divisible by 2, 3, 107, 214, and 321.
What is 642 divisible by?
1, 2, 3, 6, 107, 214, 321, 642
What are the factors and prime factors of 642?
1, 2, 3, 6, 107, 214, 321, 642 2, 3 and 107 are prime.
What is the roman numberal for the number 642?
In today's notation 642 = DCXLII in Roman numerals
Is 642 a Model number of a Remington semi-automatic rifle?
Nope, a 742 centerfire but no 642.
What times a number equals 642?
1 x 642, 2 x 321, 3 x 214, 6 x 107.
You are a numberrounding to the nearest thousand makes you 1000all your digits are eventeir sum is 12they are in order from greatest to leastand no digit is repeatedwhat number are you?
642 642
What number added to 345 equals 987?
987 - 345 = 642
