No, the "144,000" number is not figurative. The context and the rest of the Bible shows that it is a literal number.
There was a representative sample out of ancient Israel selected to work at the temple in a priestly capacity. They weren't any better than their brothers. (In fact, Levi was one of the sketchiest dudes in Jacob's family.) They numbered the Levites and numbered the guys in Israel and the difference in firstborn represented was made up for by a certain compensation because it had to be exact. It was a measurable number.
In Revelation, after talking about the set number 144,000 of those who serve in that specific assignment as priests in the heavenly kingdom capacity, it contrasts that to the great crowd of people "that no man is able to number".
The comparison between a set number and an amount "no man is able to number" shows the 144,000 is literal.
(Other times in the Bible something similar...Joseph interpreted Pharoah's dreams - the cows and wheat were symbolic but the "seven" was literal years. Also Nebuchadnezzar's dream that Daniel interpreted, the tree was figurative, symbolic of Nebuchadnezzar, but the seven times were seven literal years.)