2 and 5 will.
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80 Divide by two. 40,2 Divide by two. 20,2,2 Divide by two. 10,2,2,2 Divide by two. 5,2,2,2,2 Stop. 2 x 2 x 2 x 2 x 5 = 80
The first prime number after 80 is 83.
You divide the number by 2. If the number is able to divide WITHOUT a remainder, then it is a prime number. If you divide a number by 1, you will get the same number. That is not a prime number.
The only number that equals 80 is 80, and it's not a prime number.
They can divide by ten.