39 49 69 99 are not a prime numbers because they have other factors aside from 1 and themselves.
The other factors of:
39 = 3, 13
49 = 7
69 = 3, 23
99 = 3, 9, 11, 33,
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Let the number is x So, X+20=69 X=69-20 X=49 THE NUMBER IS 49 SO, 49 plus 20 equal to 69 .•.
No, 69/3 = 23 so it's not a prime number
Well, darling, a prime number is a number greater than 1 that can only be divided by 1 and itself. In this case, 69 can be divided by 1, 3, 23, and 69. So, unfortunately, 69 is not a prime number. But hey, it's still a fun number to say!
79-prime (1 times 79) 69-composite (2 times 69)
Composite