Source: Brahma Vaivarta Purana
रामनामांशतो जाता ब्रह्माण्डाः कोटि कोटिशः |
रामनाम्नि परे धाम्नि संस्थिताः स्वामिभिः सह ||
It is only from the Divine Name of Rama the creation of crores of Brahmandas has happened. Hence the crores of Brahmandas (entire cosmic) and all the deities are inherent in the Divine Name of Rama.
स्वभाविकी तथा ज्ञानक्रियाध्याः शक्तयः शुभाः |
रामनामांशतो जाताः सर्वलोकेषु पूजिताः ||
Hence the natural attributes of the Para Bhrama like Gnyana (omniscient), Bala (omnipotence), Aishwarya (Lordship), Shakthi (empowerment), Kriya (religious or clean act) are all present in the Divine Name of Rama and is worshipped at all times.
The general definition of the word Bhagavan is given as,
aisvaryasya samagrasya, viryasya yasasah sriyah
jnana-vairagyayos' caiva, sannam bhaga itingana
Bhagavan, the Supreme Lord, is thus defined as "He who is inseparably replete with the six inconceivable qualities of wealth, power, fame, beauty, knowledge and renunciation."
(Vishnu Purana 6.5.47)
Please check these: Excerpts from a discourse by our Sri Sri Muralidhara Swamiji
Glory of Rama Nama
Rama is indeed the highest teaching
This is the essence of all Vedas. This is the greatest among all mantras. Nectarine Rama Nama is the heart of Vedas.
Rama Nama is the very essence (‘saram’) of all Epics, Shastras and the Vedas
Realizing thus, the wise ones, the knowers of the supreme Reality; filled with fervour-bhava, meaning ardent longing for the supreme Reality; worship me by Chanting my Divine names
Only the two letter supreme Divine Name Rama Nama would grant liberation.
Rama Nama can grant all wishes at all times. Rama Nama can relieve you from any difficulty. The supreme Rama Nama could bestow all auspicious things. Let this Rama Nama be hailed everywhere.
Chant the Mahamantra Nama kirtan :
Hare Rama Hare Rama Rama Rama Hare Hare
Hare Krishna Hare Krishna Krishna Krishna Hare Hare