Are These Numbers in Standard Form?

Question 1:

5.36× 10 -6
Yes

Question 2:

0.67× 10 -6
No

Question 3:

4.89× 10 -4
Yes

Question 4:

0.2× 10 4
No

Question 5:

8.4× 10 6
Yes

Question 6:

6.02× 10 3
Yes