Sayyidah Khadija radi Allahu anha was a very successful businessperson. The Makkans would trade by sending out commercial caravans to neighbouring lands. It is said that half of any caravan was goods belonging to Sayyidah Khadija radi Allahu anha.
She used trade agents to sell her goods. In return, the agent would take a share of the profit. To this end, she entered into a business venture with RasoolAllah sallAllahu Alayhi wasallam.
When Nabi sallAllahu ayhi wasallam went on the business trip on behalf Sayyidah Khadijah radi Allahu anha, her servant accompanied him. The servant noticed that whenever Nabi SallAllahu Alayhi Wasallam went to pass urine, etc the trees would move to cover him; giving him privacy. A Jew notice the Nabi sallAllahu alayhi wasallam and told the servant that this is the final Messenger. On their way back, in the midst of the Arabian desert, an Angel shaded Nabi sallAllahu alayhi wasallam using fabric. The servant mentioned all this to Sayyidah Khadijah who proposed marriage to RasoolAllah sallAllahu alayhi wasallam, either via her Father or her Cousin. Nabi sallAllahu alayhi wasallam accepted and at the age of 25 he married her. -Tareekh Tabari-
Thus the reason she married RasoolAllah sallAllahu Alayhi wasallam was that she recognised that he was the final Nabi and it was just a matter of time before he would announce his Nabuwwa.
The 10th of Shahru Ramadhaan marks the Wisaal of Sayyidah Khadija radi Allahu anha, the first of the Pure Wives of RasoolAllah sallAllahu Alayhi wasallam. Whilst RasoolAllah sallAllahu Alayhi wasallam was married to her, he did not enter nikah with a second wife.
During the reign of Hadrath Ameer Muawiyya radi Allahu Anhu, he made the house of Sayyidah Khadija a Masjid and he decorated it with precious stones. -Tareekh Tabari.
Courtesy of Islam.Southafrica