What is the greatest prime you must consider to test whether 1471 is prime?

1471

Step-by-step explanation:

First we have to check if it is divisible with the first 15 prime numbers

1471:2=735.5 (not divisible)

1471:3=490.33 (not divisible)

1471:5=294.2 (not divisible)

1471:7=210.14 (not divisible)

1471:11=133.73 (not divisible)

1471:13=113.15 (not divisible)

1471:17=86.53 (not divisible)

1471:19=77.42 (not divisible)

1471:23=63.96 (not divisible)

1471:29=50.72 (not divisible)

1471:31=47.45 (not divisible)

1471:37=39.76 (not divisible)

1471:41=35.88 (not divisible)

1471:43=34.20 (not divisible)

1471:47=31.39 (not divisible)

1471:53=27.75

1471:61=24.11

1471:67=21.85 ...