1)
Why does it say here "Melech Malchaya"?
1.
Rashi: Chazal said, every Melech in this Sefer refers to a mortal king, except for this one, which refers to Hashem. He is the King of kings.
2)
What is "Malchusa Chisna"?
1.
Rashi: A strong and heavy kingship [He gave to you].
2.
Ibn Ezra citing Rav Sadya Gaon: A hereditary kingship.
3.
Malbim: Chosen is something that lasts. The gold head represents Nebuchadnetzar's kingship.
