A small factor. Prove that if a number greater than 1 is not a prime number, then it must have a prime factor less than or equal to its square root. (Hint: Suppose that all the factors are greater than its square root, and show that the product of any two of them must be larger than the original number.) This Mindscape shows that, to determine if a number is a prime, we have only to check divisibility of the primes up to the square root of the number.

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Chapter 2 Solutions
The Heart of Mathematics: An Invitation to Effective Thinking, WileyPLUS NextGen Card with Loose-leaf Set Single Semester: An Invitation to Effective Thinking (Key Curriculum Press)
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