Hiragana looks (as you well know) like this: あえいおう Katakana looks like this: アエイオウ 一月 (ichigatsu) is neither Hiragana nor is it Katakana (Hiragana and Katakana are called the Kanas). It is Kanji. https://en.wikipedia.org/wiki/Kanji 一月 by the way means first moon :)