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ANSWER: 70 and 80 are not prime numbers. They are composite numbers:

70 is a composite number because the factors of 70 other 1 and itself (70) are 2, 5, 7, 10, 14, and 35.

80 is also a composite number because the factors of 80 other 1 and itself (80) are 2, 4, 5, 8, 10,16, 20, and 40.

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Q: Why are 70 and 80 prime numbers?
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