No bitcoin isn't stable at all. in fact, we have seen enormous fluctuation in bitcoin price in last year and it made it literally volatile. let's have look in past to get idea regarding bitcoin price fluctuation.
Bitcoin hit an all-time high (albeit briefly) of US$1,124.76 on November 29, 2013 and In mid-November 2015, it reached $2200. it was the time bitcoin was rising steadily. The steady rise of the Bitcoin price finally resulting in something called bitcoin big bang on 15 December 2017, when it topping out a whopping $17,900. Unbelievable right? Though bitcoin could not hold that astounding price losing one-third of its value in 24 hours, dropping below $14,000 on 22 December 2017. On 5 February 2018, Bitcoin's price drops 50 percent in 16 days, falling below $7,000. Though it managed to go up again and currently trading at $9110.01. These crazy deflections in Bitcoins price clearly indicate that it is not stable.