To find whether the number is prime or composite. If the number is composite, write its prime factorization.

Answer to Problem 12C
The number is composite.
Explanation of Solution
Given Information: Number 420
Formula used: To check if the numbers is prime or composite by finding its factors. If its factors are more than 2(except 1 and the number itself), then the number is composite else prime.
Calculation:
To determine if 420 is a prime number or a composite number, simply look at the factors for 420.
If the factors of 420 are only 420 and 1, then 420 is a prime number. Otherwise, 420 is a composite number.
To explain better, if 420 is only divisible by 1 and 420, then it is a prime number, and if 420 is divisible by more than 420 and 1, then it is a composite number.
The factors of 420 are as follows:
1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 60, 70, 84, 105, 140, 210, 420
Therefore, since 420 is divisible by more than one and itself, the number is composite.
Chapter 4 Solutions
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
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