Sorry, YES a wife, and yes a wife BEFORE Abraham sired Ishmael.
Genesis 16:
3 And Sarai Abrams wife took Hagar her maid the Egyptian, after Abram had dwelt ten years in the land of Canaan, and gave her to her husband Abram to be his wife. 4 ¶ And he went in unto Hagar, and she conceived: and when she saw that she had conceived, her mistress was despised in her eyes.
So if MY wife let's me boink the cleaning lady, God will consider that to be ok then?
Sorry, but in the scripture, there is NO command from GOD to Abram to take that woman, Hagar, as his wife.
In fact...
1. Now Sarai, Abram's wife, had borne him no children. But she had an Egyptian maidservant named Hagar;
2. so she said to Abram, "The LORD has kept me from having children. Go, sleep with my maidservant; perhaps I can build a family through her." Abram agreed to what Sarai said.
Sari assigns motive to GOD: "HE has kept me"
and then Old Abe agrees to what his WIFE had conjured up!