composite, 5 can go into it
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sum of prime factors of 245 = 12factors of 245: 1, 5, 7, 35, 49, 245.prime factors of 245: 5 & 7sum of prime factors of 245: 5 + 7 = 12
4, composite. 67, prime.
prime numbers have only factors of themselves and 1; therefore 45 is composite--it has factors of 1,3,5,9,15,45
Prime
1 is special 2 prime 3 prime 4 composite 5 prime 6 composite 7 prime 8 composite 9 composite 10 composite 11 prime 12 composite ext.