Navkar (Namokar) Mantra is one single mantra, but it is made of 9 parts (lines).

1) Five main salutation lines: 1. Namo Arihantanam 2. Namo Siddhanam 3. Namo Ayariyanam 4. Namo Uvajjhayanam 5. Namo Loe Savva-Sahunam ( jainknowledge.com)

2) Four concluding lines (mangal gatha): 6. Eso pancha Namokkaro 7. Savva-pavappanasano 8. Mangalanam cha savvesim 9. Padhamam havai mangalam ( jainknowledge.com)

So:

• It is 1 mantra
• Composed of 9 lines (padas).

You can read a simple meaning of Navkar Mantra here