In Jain Dharma, there isn’t a fixed, countable number of human souls across time. The universe is vast and contains innumerable beings—humans, in various realms—within vast cycles of time. So a figure like “600 billion humans” isn’t a standard or supported Jain cosmological or religious claim.

If you’re asking about today’s population, current global estimates are around 8 billion people, not 600 billion. Jain thought often emphasizes the vastness and multiplicity of souls in the cosmos rather than focusing on exact tallies of one species at a moment in time.

If you’d like, I can share how Jain scriptures describe the creation and expansion of worlds, or how the soul’s journey (ajiva) is viewed in different Jain traditions.