If the stipend was a payment for your services, it would be considered income and it would be taxable.
Usually, when this is the case, the stipend amount is reported on a W-2.
Since you received a 1098-T from the school, it seems as if the educational institution is treating this as a scholarship or grant. Since you are a grad student, you would be liable for tax on a scholarship as well, unless it was offset by the tuition fees.
1098-T, box 2 shows what the University billed, and box 5 shows the grant amount. If box 5 has an amount that you recognize as the stipend you received, they are treating it as a grant or scholarship.
Enter the information as you would for any other 1098-T.
As long as you were billed more than the "stipend" (box 5) you will have no tax due, but you still need to report it.
If there is a surplus of the "stipend" box 5, because you are a grad student, you may be liable to pay tax on it.
