Yes
16
1and itself, this number is a prime number
Because the prime numbers between 1and 50 only have exactly 2 unique factors.
Yes, that can be taken as the definition of a prime number. The number 1 is usually excluded from the prime numbers, for different reasons.
Factors.
1 1 and 3
Only common is one only
15 and 30 have those factors.
Any number divided by itself is 1.1 divided by 1 = 12 divided by 2 = 13 divided by 3 = 1and so onOne.
the factors of 22 are --- 1 and 22... 2 and 11 the factors of 8 are --- 1and 8... 2 and 4 the common factors are 2
315