There are no other whole numbers besides ' 1 ' and 19 that go into 19 evenly. That makes 19 a prime number.
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
Two: 1 and 53.
1,2,4,8,16,32
1,3,5,9,15,45
1 and 53
The only such number is 1.
There are no other whole numbers besides ' 1 ' and 19 that go into 19 evenly. That makes 19 a prime number.
no numbers!
No numbers besides itself and 1 go into it evenly. The most common numbers to check are 2,3,4,5,6,9, and 10. THe rest you can figure out with times tables.
Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
Two: 1 and 53.
The numbers that go into 30 are1, 2, 3, 5, 30, 15, 10, 6
53 and 2 are both prime numbers and their LCM is 106
60.5
1,2,3,6,7
11,6,1,2,33