Answer

Yes, the Navkar Mantra is commonly understood as having 5 lines.

Explanation

These 5 lines are salutations to the Pancha Parameshthi:

1. Arihant
2. Siddha
3. Acharya
4. Upadhyaya
5. Sadhu

Each line is a respectful bow to one of these supreme spiritual states.

Spiritual Understanding

The Navkar Mantra is special because it does not praise one specific person or deity. It honors the highest ideals of Jain Dharma — purity, liberation, discipline, knowledge, and renunciation.

That is why it is considered the most important mantra in Jainism.

Takeaway

So yes, in the usual form, the Navkar Mantra has 5 lines, each offering reverence to one of the five supreme beings.