1998 AHSME Problem 6

If 1998 is written as a product of two positive integers whose difference is as small as possible, then the difference is

\mathrm{(A) \ }8 \qquad \mathrm{(B) \ }15 \qquad \mathrm{(C) \ }17 \qquad \mathrm{(D) \ }47 \qquad \mathrm{(E) \ } 93

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.