FactorInteger
 Usage
• FactorInteger[n] gives a list of the prime factors of the integer n, together with their exponents.
Notes
• Example: FactorInteger[2434500]  . • For negative numbers, the unit {-1, 1} is included in the list of factors. • FactorInteger also works on rational numbers. The prime factors of the denominator are given with negative exponents. • FactorInteger[n, GaussianIntegers->True] factors over Gaussian integers. • FactorInteger[m + I m] automatically works over the Gaussian integers. • When necessary, a unit of the form {-1, 1}, {I, 1} or {-I, 1} is included in the list of factors. • FactorInteger[n, FactorComplete->False] does fast but not necessarily complete factorization, and extracts only factors that are easy to find. • New in Version 1; modified in 5.
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