4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30
No, it is not a prime number.
In 28, 7. In 16, 2
It is 18, the number in the middle when they are arranged in order.
theres only one even prime number, thats 2 prime numbers can only be divided by themselves, and 1 21, divisible by 3 or 7, so no 28 even number other than 2, so no 15, divisible by 3 or 5, so no 17 divisible only by itself and 1, so yes 28, even number, other than 2, so no
To determine the least common multiple of two numbers, determine the prime factors of both number. Then, determine the prime factors they have in common. Multiply all their prime factors together (in other words, multiply both numbers together) and divide by the prime factors they have in common (in other words, their greatest common factor). The prime factors of 21 are 3 and 7. The prime factors of 28 are 2, 2, and 7. The prime factors in common are a single 7. Therefore, the lowest common multiple is 21 x 28 ÷ 7 = 84
Multiples of 7 are 7, 14, 21, 28, 35, 42, 49, ..... None of these are prime numbers except 7.
No, 28 is a Composite Number.
84 is not a prime. All numbers ending in four are composite.
16: 2 28: 2, 7 81: 3
21 and 28 are composite.
Prime factors of 256=2x2x2x2x2x2x2x2 (or 28)