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Q: What are all the prime factors up to 100?

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All of the prime numbers up to 10000 can be prime factors.

All composite numbers have more than 2 factors but prime numbers have only 2 factors

Yes 641 is a prime number. You would need to check all the factors up to the square root of 641. So you need to look at all the possible prime factors up to 25. Some can be skipped such as 2 and 3.

' 2 ' is the only even prime number.

Assuming you want all factors of a number: 1) Split a number into prime factors. 2) Combine the prime factors in all possible ways. To get the prime factors, you can systematically try out dividing the number by prime numbers, up to the number's square root (once the square of the prime number you try out is greater than the original number, you need not continue). For example, to find out prime factors of numbers up to 120, you only need to try dividing by 2, 3, 5, 7.

To find common factors, you first need to break the numbers up into their prime factors: 9=3x3 100=2x2x5x5 The next step would be to identify the common prime factors. In this case we can see that there are none, and thus the HCF, and indeed the only number that goes into both 9 and 100, is 1.

64 and 96 have the longest prime factorizations in that range. If you're asking about distinct prime factors, quite a few are tied with three.

41 is a prime number because if you check all the factors: 2,3,4,5,6,7,8 etc. You will end up with the 2 factors: 1 and 41.

Prime numbers up to 10: 2, 3, 5 and 7 Prime factors of 10: 2 and 5

To find out if a number is a square number, find its prime factors and check if all prime factors duplicate. In this example, the prime factors are: 2,2,5,5,5,5 We can see that all numbers are duplicates, and can be paired up. So 2500 is a square number of 2x5x5 or 50.

The only number between 30 and 40 with distinct prime factors which add up to 12 is 35.

The prime factors of 22 are 2 and 11 which add up to 13

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