A number with only one factor pair is........ a prime number for example 11 the only factor pair is one times 11.
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A composite number.
A prime number,for example: 2, 3, 5, 7, 11, 13, 17, 19 and so on.
Since 17 is a prime number, there is only one pair of distinct positive integer factors of the number:17 x 1 = 17
You want the only shared prime factor to be 7, and the unique prime factors to be 5 and 2. Thus, one answer is 7x2 and 7x5 The number pair is 14 and 35 or 7 and 70.
The skinny one. A prime number only has two factors (one rectangle). The factors are one and the number itself.